diff --git a/direct/src/p3d/Packager.py b/direct/src/p3d/Packager.py
index 16ebdabbff..5efebd1869 100644
--- a/direct/src/p3d/Packager.py
+++ b/direct/src/p3d/Packager.py
@@ -16,6 +16,7 @@ import types
 import getpass
 import struct
 import subprocess
+import copy
 from direct.p3d.FileSpec import FileSpec
 from direct.p3d.SeqValue import SeqValue
 from direct.showbase import Loader
@@ -839,6 +840,14 @@ class Packager:
             self.packager.contents[pe.getKey()] = pe
             self.packager.contentsChanged = True
 
+            # Hack for coreapi package, to preserve backward compatibility
+            # with old versions of the runtime, which still called the
+            # 32-bit Windows platform "win32".
+            if self.packageName == "coreapi" and self.platform == "win_i386":
+                pe2 = copy.copy(pe)
+                pe2.platform = "win32"
+                self.packager.contents[pe2.getKey()] = pe2
+
             self.cleanup()
             return True
 
@@ -1832,7 +1841,10 @@ class Packager:
                         self.notify.warning(message)
                     return
 
-            self.freezer.addModule(moduleName, filename = file.filename)
+            if file.text:
+                self.freezer.addModule(moduleName, filename = file.filename, text = file.text)
+            else:
+                self.freezer.addModule(moduleName, filename = file.filename)
 
         def addEggFile(self, file):
             # Precompile egg files to bam's.
diff --git a/direct/src/p3d/panda3d.pdef b/direct/src/p3d/panda3d.pdef
index 4f3df21c97..87a42eff2b 100644
--- a/direct/src/p3d/panda3d.pdef
+++ b/direct/src/p3d/panda3d.pdef
@@ -362,8 +362,16 @@ class rocket(package):
     config(display_name = "Panda3D libRocket support")
     require('panda3d')
 
-    module('panda3d.rocket', required = True)
-    module('_rocketcore', '_rocketcontrols')
+    file('rocket.py', extract = True, text = """
+from _rocketcore import *
+try:
+    from _rocketcontrols import *
+except ImportError:
+    pass
+""")
+
+    module('panda3d.rocket', '_rocketcore', required = True)
+    module('_rocketcontrols')
     file('libp3rocket.dll', required = True)
 
 class vrpn(package):
diff --git a/direct/src/plugin/p3dInstanceManager.cxx b/direct/src/plugin/p3dInstanceManager.cxx
index b5536b8836..793e6cf36e 100644
--- a/direct/src/plugin/p3dInstanceManager.cxx
+++ b/direct/src/plugin/p3dInstanceManager.cxx
@@ -258,14 +258,22 @@ initialize(int api_version, const string &contents_filename,
 
     // TODO: Linux multiplatform support.  Just add the
     // appropriate platform strings to _supported_platforms.
+  } else {
+    nout << "Platform string was set by plugin to " << _platform << "\n";
   }
 
   if (_supported_platforms.empty()) {
+    // Hack for older plug-ins, which should still remain compatible with
+    // newer versions of the runtime distribution.
+    if (_platform == "win32") {
+      _supported_platforms.push_back("win_i386");
+    }
+
     // We always support at least the specific platform on which we're
     // running.
     _supported_platforms.push_back(_platform);
   }
-      
+
 #ifdef P3D_PLUGIN_LOG_DIRECTORY
   if (_log_directory.empty()) {
     _log_directory = P3D_PLUGIN_LOG_DIRECTORY;
diff --git a/direct/src/plugin/p3dX11SplashWindow.cxx b/direct/src/plugin/p3dX11SplashWindow.cxx
index f1afc5a15b..76c0175a18 100644
--- a/direct/src/plugin/p3dX11SplashWindow.cxx
+++ b/direct/src/plugin/p3dX11SplashWindow.cxx
@@ -681,10 +681,13 @@ subprocess_run() {
       }
     }
 
-    if (input_ready) {
+    while (input_ready) {
+      // Empty the pipe of whatever is in it.
       receive_command();
+      input_ready = _pipe_read.has_gdata();
     }
 
+    // Sleep a good amount in order not to lock up the system.
     struct timespec req;
     req.tv_sec = 0;
     req.tv_nsec = 50000000;  // 50 ms
diff --git a/direct/src/showbase/VFSImporter.py b/direct/src/showbase/VFSImporter.py
index 1fc8c6796d..16b1ac4bec 100644
--- a/direct/src/showbase/VFSImporter.py
+++ b/direct/src/showbase/VFSImporter.py
@@ -76,8 +76,7 @@ class VFSImporter:
             if desc[2] != imp.C_EXTENSION:
                 continue
 
-            filename = Filename(path)
-            filename.setExtension(desc[0][1:])
+            filename = Filename(path + desc[0])
             vfile = vfs.getFile(filename, True)
             if vfile:
                 return VFSLoader(dir_path, vfile, filename, FTExtensionModule,
diff --git a/direct/src/showutil/FreezeTool.py b/direct/src/showutil/FreezeTool.py
index 871cf403a2..50f1077e30 100644
--- a/direct/src/showutil/FreezeTool.py
+++ b/direct/src/showutil/FreezeTool.py
@@ -8,6 +8,7 @@ import marshal
 import imp
 import platform
 import types
+from StringIO import StringIO
 from distutils.sysconfig import PREFIX, get_python_inc, get_python_version, get_config_var
 
 # Temporary (?) try..except to protect against unbuilt p3extend_frozen.
@@ -497,7 +498,8 @@ class Freezer:
         def __init__(self, moduleName, filename = None,
                      implicit = False, guess = False,
                      exclude = False, forbid = False,
-                     allowChildren = False, fromSource = None):
+                     allowChildren = False, fromSource = None,
+                     text = None):
             # The Python module name.
             self.moduleName = moduleName
 
@@ -532,6 +534,9 @@ class Freezer:
             # record came from, supplied by the caller.
             self.fromSource = fromSource
 
+            # If this is set, it contains Python code of the module.
+            self.text = text
+
             # Some sanity checks.
             if not self.exclude:
                 self.allowChildren = True
@@ -748,7 +753,8 @@ class Freezer:
         return modules
 
     def addModule(self, moduleName, implicit = False, newName = None,
-                  filename = None, guess = False, fromSource = None):
+                  filename = None, guess = False, fromSource = None,
+                  text = None):
         """ Adds a module to the list of modules to be exported by
         this tool.  If implicit is true, it is OK if the module does
         not actually exist.
@@ -804,7 +810,7 @@ class Freezer:
                     # It's actually a regular module.
                     self.modules[newParentName] = self.ModuleDef(
                         parentName, implicit = implicit, guess = guess,
-                        fromSource = fromSource)
+                        fromSource = fromSource, text = text)
 
                 else:
                     # Now get all the py files in the parent directory.
@@ -819,7 +825,7 @@ class Freezer:
             # A normal, explicit module name.
             self.modules[newName] = self.ModuleDef(
                 moduleName, filename = filename, implicit = implicit,
-                guess = guess, fromSource = fromSource)
+                guess = guess, fromSource = fromSource, text = text)
 
     def done(self, compileToExe = False):
         """ Call this method after you have added all modules with
@@ -970,7 +976,10 @@ class Freezer:
                 stuff = ("", "rb", imp.PY_COMPILED)
                 self.mf.load_module(mdef.moduleName, fp, pathname, stuff)
             else:
-                fp = open(pathname, 'U')
+                if mdef.text:
+                    fp = StringIO(mdef.text)
+                else:
+                    fp = open(pathname, 'U')
                 stuff = ("", "r", imp.PY_SOURCE)
                 self.mf.load_module(mdef.moduleName, fp, pathname, stuff)
 
diff --git a/makepanda/makepanda.py b/makepanda/makepanda.py
index 28acd9b1f8..d7269f78b1 100755
--- a/makepanda/makepanda.py
+++ b/makepanda/makepanda.py
@@ -455,9 +455,8 @@ SdkAutoDisableMax()
 SdkAutoDisablePhysX()
 SdkAutoDisableSpeedTree()
 
-if (RTDIST and DISTRIBUTOR == "cmu"):
-    HOST_URL = "https://runtime.panda3d.org/"
-
+if RTDIST and DISTRIBUTOR == "cmu":
+    # Some validation checks for the CMU builds.
     if (RTDIST_VERSION == "cmu_1.7" and SDK["PYTHONVERSION"] != "python2.6"):
         exit("The CMU 1.7 runtime distribution must be built against Python 2.6!")
     elif (RTDIST_VERSION == "cmu_1.8" and SDK["PYTHONVERSION"] != "python2.7"):
@@ -465,7 +464,7 @@ if (RTDIST and DISTRIBUTOR == "cmu"):
     elif (RTDIST_VERSION == "cmu_1.9" and SDK["PYTHONVERSION"] != "python2.7"):
         exit("The CMU 1.9 runtime distribution must be built against Python 2.7!")
 
-elif RTDIST and not HOST_URL:
+if RTDIST and not HOST_URL:
     exit("You must specify a host URL when building the rtdist!")
 
 if RUNTIME and not HOST_URL:
diff --git a/panda/src/rocket/rocketInputHandler.cxx b/panda/src/rocket/rocketInputHandler.cxx
index 71ea099192..c0a4e22464 100644
--- a/panda/src/rocket/rocketInputHandler.cxx
+++ b/panda/src/rocket/rocketInputHandler.cxx
@@ -34,6 +34,8 @@ TypeHandle RocketInputHandler::_type_handle;
 RocketInputHandler::
 RocketInputHandler(const string &name) :
   DataNode(name),
+  _mouse_xy(-1),
+  _mouse_xy_changed(false),
   _modifiers(0),
   _wheel_delta(0)
 {
diff --git a/pandatool/src/progbase/programBase.cxx b/pandatool/src/progbase/programBase.cxx
index 94bcb0e13b..a9b7c666bf 100644
--- a/pandatool/src/progbase/programBase.cxx
+++ b/pandatool/src/progbase/programBase.cxx
@@ -27,7 +27,7 @@
 #include "configVariableBool.h"
 #include "panda_getopt_long.h"
 #include "preprocess_argv.h"
-#include "pandaVersion.h"
+#include "pandaSystem.h"
 
 #include <stdlib.h>
 #include <algorithm>
@@ -222,7 +222,8 @@ write_man_page(ostream &out) {
     }
   }
 
-  out << " 1 \"" << date_str << "\" \"" PANDA_VERSION_STR "\" Panda3D\n";
+  out << " 1 \"" << date_str << "\" \""
+      << PandaSystem::get_version_string() << "\" Panda3D\n";
 
   out << ".SH NAME\n";
   if (_brief.empty()) {