diff --git a/LICENSE.txt b/LICENSE.txt
index 9e419e0..20d40b6 100644
--- a/LICENSE.txt
+++ b/LICENSE.txt
@@ -1,4 +1,4 @@
-GNU GENERAL PUBLIC LICENSE
+                    GNU GENERAL PUBLIC LICENSE
                        Version 3, 29 June 2007
 
  Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>
diff --git a/ext/crlib/cr-ulz.h b/ext/crlib/cr-ulz.h
index f339918..a4d2b6d 100644
--- a/ext/crlib/cr-ulz.h
+++ b/ext/crlib/cr-ulz.h
@@ -20,7 +20,7 @@
 CR_NAMESPACE_BEGIN
 
 // see https://github.com/encode84/ulz/
-class ULZ final : DenyCopying {
+class ULZ final : public Singleton <ULZ> {
 public:
    enum : int32 {
       Excess = 16,
@@ -314,4 +314,7 @@ private:
    }
 };
 
+// expose global ulz object
+CR_EXPOSE_GLOBAL_SINGLETON (ULZ, ulz);
+
 CR_NAMESPACE_END
diff --git a/inc/graph.h b/inc/graph.h
index 91c07ae..5864a70 100644
--- a/inc/graph.h
+++ b/inc/graph.h
@@ -83,7 +83,7 @@ CR_DECLARE_SCOPED_ENUM (StorageOption,
 
 // storage header versions
 CR_DECLARE_SCOPED_ENUM (StorageVersion,
-   Graph = 1,
+   Graph = 2,
    Practice = 1,
    Vistable = 1,
    Matrix = 1,
@@ -251,6 +251,7 @@ private:
       int x, y, z;
    };
 
+   int m_version;
    int m_editFlags;
    int m_loadAttempts;
    int m_cacheNodeIndex;
@@ -325,6 +326,7 @@ public:
 
    bool saveGraphData ();
    bool loadGraphData ();
+   bool canDownload ();
 
    template <typename U> bool saveStorage (StringRef ext, StringRef name, StorageOption options, StorageVersion version, const SmallArray <U> &data, ExtenHeader *exten);
    template <typename U> bool loadStorage (StringRef ext, StringRef name, StorageOption options, StorageVersion version, SmallArray <U> &data, ExtenHeader *exten, int32 *outOptions);
diff --git a/meson.build b/meson.build
index 1aee964..3f003ce 100644
--- a/meson.build
+++ b/meson.build
@@ -70,7 +70,7 @@ cdata.set ('commitCount', run_command ('git', 'rev-list', '--count', 'HEAD').std
 cdata.set ('commitAuthor', run_command ('git', 'log', '--pretty="%ae"', '-1').stdout ().strip ())
 
 cdata.set ('buildVersion', buildVersion)
-cdata.set ('buildMachine', run_command ('hostname').stdout ().strip ())
+cdata.set ('buildMachine', run_command ('hostname', '-f').stdout ().strip ())
 cdata.set ('buildCompiler', compilerId + ' ' + compilerVersion)
 
 configure_file (input: 'inc/version.h.in', output: 'version.build.h', configuration: cdata)
diff --git a/src/botlib.cpp b/src/botlib.cpp
index 18db4da..02dc84c 100644
--- a/src/botlib.cpp
+++ b/src/botlib.cpp
@@ -2940,6 +2940,8 @@ void Bot::frame () {
 }
 
 void Bot::update () {
+   pev->flags |= FL_FAKECLIENT; // restore fake client bit
+
    pev->button = 0;
 
    m_moveSpeed = 0.0f;
diff --git a/src/config.cpp b/src/config.cpp
index c84074d..0806c66 100644
--- a/src/config.cpp
+++ b/src/config.cpp
@@ -586,7 +586,7 @@ void BotConfig::loadDifficultyConfig () {
    if (util.openConfig ("difficulty.cfg", "Difficulty config file not found. Loading defaults.", &file)) {
 
       while (file.getLine (line)) {
-         if (isCommentLine (line)) {
+         if (isCommentLine (line) || line.length () < 3) {
             continue;
          }
          auto items = line.split ("=");
diff --git a/src/control.cpp b/src/control.cpp
index afcccf2..0a1df8a 100644
--- a/src/control.cpp
+++ b/src/control.cpp
@@ -269,8 +269,25 @@ int BotControl::cmdCvars () {
 int BotControl::cmdNode () {
    enum args { root, alias, cmd, cmd2 };
 
+   static Array <StringRef> allowedOnDedicatedServer {
+      "acquire_editor",
+      "upload",
+      "save",
+      "load"
+   };
+
+   // check if cmd is allowed on dedicated server
+   auto isAllowedOnDedicatedServer = [] (StringRef str) -> bool {
+      for (const auto &test : allowedOnDedicatedServer) {
+         if (test == str) {
+            return true;
+         }
+      }
+      return false;
+   };
+
    // graph editor supported only with editor
-   if (game.isDedicated () && !graph.hasEditor () && strValue (cmd) != "acquire_editor" && strValue (cmd) != "upload") {
+   if (game.isDedicated () && !graph.hasEditor () && !isAllowedOnDedicatedServer (strValue (cmd))) {
       msg ("Unable to use graph edit commands without setting graph editor player. Please use \"graph acquire_editor\" to acquire rights for graph editing.");
       return BotCommandResult::Handled;
    }
@@ -738,7 +755,7 @@ int BotControl::cmdNodeUpload () {
    http.setTimeout (6);
 
    // try to upload the file
-   if (http.uploadFile ("http://yapb.ru/graph", strings.format ("%sgraph/%s.graph", graph.getDataDirectory (false), game.getMapName ()))) {
+   if (http.uploadFile (strings.format ("http://%s/graph", product.download), strings.format ("%sgraph/%s.graph", graph.getDataDirectory (false), game.getMapName ()))) {
       msg ("Graph file was successfully validated and uploaded to the YaPB Graph DB (%s).", product.download);
       msg ("It will be available for download for all YaPB users in a few minutes.");
       msg ("\n");
diff --git a/src/graph.cpp b/src/graph.cpp
index 5b28b24..acb0b11 100644
--- a/src/graph.cpp
+++ b/src/graph.cpp
@@ -16,7 +16,7 @@
 #include <yapb.h>
 
 ConVar cv_graph_fixcamp ("yb_graph_fixcamp", "1", "Specifies whether bot should not 'fix' camp directions of camp waypoints when loading old PWF format.");
-ConVar cv_graph_url ("yb_graph_url", product.download.chars (), "Specifies the URL from bots will be able to download graph in case of missing local one.", false, 0.0f, 0.0f);
+ConVar cv_graph_url ("yb_graph_url", product.download.chars (), "Specifies the URL from bots will be able to download graph in case of missing local one. Set to empty, if no downloads needed.", false, 0.0f, 0.0f);
 
 void BotGraph::initGraph () {
    // this function initialize the graph structures..
@@ -1316,6 +1316,13 @@ void BotGraph::initNarrowPlaces () {
    if (m_paths.empty () || m_narrowChecked) {
       return;
    }
+   constexpr int32 kNarrowPlacesMinGraphVersion = 2;
+
+   // if version 2 or higher, narrow places already initialized and saved into file
+   if (m_version >= kNarrowPlacesMinGraphVersion) {
+      m_narrowChecked = true;
+      return;
+   }
    TraceResult tr;
 
    const auto distance = 178.0f;
@@ -1518,13 +1525,11 @@ template <typename U> bool BotGraph::saveStorage (StringRef ext, StringRef name,
 
       return false;
    }
-   ULZ lz;
-
    int32 rawLength = data.template length <int32> () * sizeof (U);
    SmallArray <uint8> compressed (rawLength + sizeof (uint8) * ULZ::Excess);
 
    // try to compress
-   auto compressedLength = lz.compress (reinterpret_cast <uint8 *> (data.data ()), rawLength, reinterpret_cast <uint8 *> (compressed.data ()));
+   auto compressedLength = ulz.compress (reinterpret_cast <uint8 *> (data.data ()), rawLength, reinterpret_cast <uint8 *> (compressed.data ()));
 
    if (compressedLength > 0) {
       StorageHeader hdr {};
@@ -1585,11 +1590,11 @@ template <typename U> bool BotGraph::loadStorage (StringRef ext, StringRef name,
 
    // downloader for graph
    auto download = [&] () -> bool {
-      auto downloadAddress = cv_graph_url.str ();
-
-      if (strings.isEmpty (downloadAddress)) {
+      if (!graph.canDownload ()) {
          return false;
       }
+      auto downloadAddress = cv_graph_url.str ();
+
       auto toDownload = strings.format ("%sgraph/%s", getDataDirectory (false), filename);
       auto fromDownload = strings.format ("http://%s/graph/%s", downloadAddress, filename);
 
@@ -1599,7 +1604,7 @@ template <typename U> bool BotGraph::loadStorage (StringRef ext, StringRef name,
          return true;
       }
       else {
-         game.print ("Can't download '%s'. from '%s' to '%s'... (%d).", filename, fromDownload, toDownload, http.getLastStatusCode ());
+         game.print ("Can't download '%s' from '%s' to '%s'... (%d).", filename, fromDownload, toDownload, http.getLastStatusCode ());
       }
       return false;
    };
@@ -1656,13 +1661,18 @@ template <typename U> bool BotGraph::loadStorage (StringRef ext, StringRef name,
    }
 
    // check the version
-   if (hdr.version != version) {
+   if (hdr.version > version) {
       if (tryReload ()) {
          return true;
       }
       return raiseLoadingError (isGraph, file, "Damaged %s (filename: '%s'). Version number differs (got: '%d', need: '%d').", name, filename, hdr.version, version);
    }
 
+   // save graph version
+   if (isGraph) {
+      m_version = hdr.version;
+   }
+
    // check the storage type
    if ((hdr.options & options) != options) {
       return raiseLoadingError (isGraph, file, "Incorrect storage format for %s (filename: '%s').", name, filename);
@@ -1676,10 +1686,9 @@ template <typename U> bool BotGraph::loadStorage (StringRef ext, StringRef name,
 
    // read compressed data
    if (file.read (compressed.data (), sizeof (uint8), hdr.compressed) == static_cast <size_t> (hdr.compressed)) {
-      ULZ lz;
 
       // try to uncompress
-      if (lz.uncompress (compressed.data (), hdr.compressed, reinterpret_cast <uint8 *> (data.data ()), hdr.uncompressed) == ULZ::UncompressFailure) {
+      if (ulz.uncompress (compressed.data (), hdr.compressed, reinterpret_cast <uint8 *> (data.data ()), hdr.uncompressed) == ULZ::UncompressFailure) {
          return raiseLoadingError (isGraph, file, "Unable to decompress ULZ data for %s (filename: '%s').", name, filename);
       }
       else {
@@ -1692,7 +1701,7 @@ template <typename U> bool BotGraph::loadStorage (StringRef ext, StringRef name,
          if ((hdr.options & StorageOption::Exten) && exten != nullptr) {
             file.read (exten, sizeof (ExtenHeader));
          }
-         game.print ("Successfully loaded Bots %s data (%d/%.2fMB).", name, m_paths.length (), static_cast <float> (data.capacity () * sizeof (U)) / 1024.0f / 1024.0f);
+         game.print ("Successfully loaded Bots %s data v%d.0 (%d/%.2fMB).", name, hdr.version, m_paths.length (), static_cast <float> (data.capacity () * sizeof (U)) / 1024.0f / 1024.0f);
          file.close ();
 
          return true;
@@ -1747,6 +1756,10 @@ bool BotGraph::loadGraphData () {
    return false;
 }
 
+bool BotGraph::canDownload () {
+   return !strings.isEmpty (cv_graph_url.str ());
+}
+
 bool BotGraph::saveGraphData () {
    auto options = StorageOption::Graph | StorageOption::Exten;
    String author;
@@ -1754,7 +1767,9 @@ bool BotGraph::saveGraphData () {
    if (game.isNullEntity (m_editor) && !m_tempStrings.empty ()) {
       author = m_tempStrings;
 
-      options |= StorageOption::Recovered;
+      if (!game.isDedicated ()) {
+         options |= StorageOption::Recovered;
+      }
    }
    else if (!game.isNullEntity (m_editor)) {
       author = m_editor->v.netname.chars ();
@@ -1772,6 +1787,10 @@ bool BotGraph::saveGraphData () {
    strings.copy (exten.author, author.chars (), cr::bufsize (exten.author));
    exten.mapSize = engfuncs.pfnGetFileSize (strings.format ("maps/%s.bsp", game.getMapName ()));
 
+   // ensure narrow places saved into file
+   m_narrowChecked = false;
+   initNarrowPlaces ();
+
    return saveStorage <Path> ("graph", "Graph", static_cast <StorageOption> (options), StorageVersion::Graph, m_paths, &exten);
 }
 
@@ -2798,8 +2817,10 @@ BotGraph::BotGraph () {
    m_rescuePoints.clear ();
    m_sniperPoints.clear ();
 
+   m_version = StorageVersion::Graph;
    m_loadAttempts = 0;
    m_editFlags = 0;
+
    m_pathDisplayTime = 0.0f;
    m_arrowDisplayTime = 0.0f;
    m_autoPathDistance = 250.0f;