diff --git a/python/build/idea.properties b/python/build/idea.properties
index 60d25822ce71..5c76204e9b5a 100644
--- a/python/build/idea.properties
+++ b/python/build/idea.properties
@@ -53,6 +53,11 @@ idea.popup.weight=heavy
 #----------------------------------------------------------------------
 sun.java2d.noddraw=true
 
+#----------------------------------------------------------------------
+# Removing this property may lead to editor performance degradation under Windows.
+#----------------------------------------------------------------------
+sun.java2d.d3d=false
+
 #-----------------------------------------------------------------------
 # PyCharm copies library jars to prevent their locking. If copying is not desirable, specify "true"
 #-----------------------------------------------------------------------
diff --git a/python/helpers/pydev/pydevd_frame.py b/python/helpers/pydev/pydevd_frame.py
index fc224500464a..6c7168d88f45 100644
--- a/python/helpers/pydev/pydevd_frame.py
+++ b/python/helpers/pydev/pydevd_frame.py
@@ -38,7 +38,7 @@ class PyDBFrame:
 
             can_skip = False
 
-            if len(always_exception_set):
+            if not always_exception_set:
                 if info.pydev_state == STATE_RUN:
                     #we can skip if:
                     #- we have no stop marked
diff --git a/python/src/META-INF/python-plugin-common.xml b/python/src/META-INF/python-plugin-common.xml
index 91c4bbbc2f32..ba0b3bab0b6d 100644
--- a/python/src/META-INF/python-plugin-common.xml
+++ b/python/src/META-INF/python-plugin-common.xml
@@ -480,6 +480,7 @@
     <annotator language="ReST" implementationClass="com.jetbrains.rest.validation.RestAnnotatingVisitor"/>
     <projectService serviceInterface="com.jetbrains.rest.actions.PyRestructuredSettings"
                     serviceImplementation="com.jetbrains.rest.actions.PyRestructuredSettings"/>
+    <inspectionToolProvider implementation="com.jetbrains.rest.inspections.RestInspectionToolProvider"/>
 
   </extensions>
 
diff --git a/python/src/com/jetbrains/python/sdk/PythonSdkFlavor.java b/python/src/com/jetbrains/python/sdk/PythonSdkFlavor.java
index 96e7b28db1ab..cd5417fdefbe 100644
--- a/python/src/com/jetbrains/python/sdk/PythonSdkFlavor.java
+++ b/python/src/com/jetbrains/python/sdk/PythonSdkFlavor.java
@@ -2,6 +2,7 @@ package com.jetbrains.python.sdk;
 
 import com.intellij.execution.configurations.GeneralCommandLine;
 import com.intellij.execution.process.ProcessOutput;
+import com.intellij.openapi.diagnostic.Logger;
 import com.intellij.openapi.util.SystemInfo;
 import com.intellij.openapi.util.io.FileUtil;
 import com.intellij.openapi.util.text.StringUtil;
@@ -16,6 +17,8 @@ import java.util.regex.Pattern;
  * @author yole
  */
 public abstract class PythonSdkFlavor {
+  private static final Logger LOG = Logger.getInstance(PythonSdkFlavor.class);
+
   public static String appendSystemPythonPath(String pythonPath) {
     String syspath = systemPythonPath();
     if (syspath != null) {
@@ -73,16 +76,24 @@ public abstract class PythonSdkFlavor {
     return file.isFile() && FileUtil.getNameWithoutExtension(file).toLowerCase().startsWith("python");
   }
 
+  @Nullable
   public String getVersionString(String sdkHome) {
     return getVersionFromOutput(sdkHome, "-V", "(Python \\S+).*", false);
   }
 
+  @Nullable
   protected static String getVersionFromOutput(String sdkHome, String version_opt, String version_regexp, boolean stdout) {
     Pattern pattern = Pattern.compile(version_regexp);
     String run_dir = new File(sdkHome).getParent();
     final ProcessOutput process_output = SdkUtil.getProcessOutput(run_dir, new String[]{sdkHome, version_opt});
     if (process_output.getExitCode() != 0) {
-      throw new RuntimeException(process_output.getStderr() + " (exit code " + process_output.getExitCode() + ")");
+      String err = process_output.getStderr();
+      if (StringUtil.isEmpty(err)) {
+        err = process_output.getStdout();
+      }
+      LOG.warn("Couldn't get interpreter version: process exited with code " + process_output.getExitCode() + "\n" + err
+      );
+      return null;
     }
     final List<String> lines = stdout ? process_output.getStdoutLines() : process_output.getStderrLines();
     return SdkUtil.getFirstMatch(lines, pattern);