diff --git a/python/src/com/jetbrains/python/codeInsight/userSkeletons/PyUserSkeletonsUtil.java b/python/src/com/jetbrains/python/codeInsight/userSkeletons/PyUserSkeletonsUtil.java
index da0ad54784d0..2d0fd8d42868 100644
--- a/python/src/com/jetbrains/python/codeInsight/userSkeletons/PyUserSkeletonsUtil.java
+++ b/python/src/com/jetbrains/python/codeInsight/userSkeletons/PyUserSkeletonsUtil.java
@@ -17,6 +17,7 @@ package com.jetbrains.python.codeInsight.userSkeletons;
 
 import com.intellij.openapi.application.ApplicationManager;
 import com.intellij.openapi.application.PathManager;
+import com.intellij.openapi.diagnostic.Logger;
 import com.intellij.openapi.extensions.Extensions;
 import com.intellij.openapi.project.Project;
 import com.intellij.openapi.projectRoots.Sdk;
@@ -53,7 +54,10 @@ import java.util.List;
  */
 public class PyUserSkeletonsUtil {
   public static final String USER_SKELETONS_DIR = "python-skeletons";
+  private static final Logger LOG = Logger.getInstance("#com.jetbrains.python.codeInsight.userSkeletons.PyUserSkeletonsUtil");
+
   @Nullable private static VirtualFile ourUserSkeletonsDirectory;
+  private static boolean ourNoSkeletonsErrorReported = false;
 
   @NotNull
   private static List<String> getPossibleUserSkeletonsPaths() {
@@ -75,6 +79,10 @@ public class PyUserSkeletonsUtil {
         }
       }
     }
+    if (!ourNoSkeletonsErrorReported && ourUserSkeletonsDirectory == null) {
+      ourNoSkeletonsErrorReported = true;
+      LOG.error("python-skeletons directory not found in paths: " + getPossibleUserSkeletonsPaths());
+    }
     return ourUserSkeletonsDirectory;
   }
 
diff --git a/python/src/com/jetbrains/python/lexer/PyStringLiteralLexer.java b/python/src/com/jetbrains/python/lexer/PyStringLiteralLexer.java
index 10c8c9be41cb..4ed6435982c7 100644
--- a/python/src/com/jetbrains/python/lexer/PyStringLiteralLexer.java
+++ b/python/src/com/jetbrains/python/lexer/PyStringLiteralLexer.java
@@ -57,7 +57,6 @@ public class PyStringLiteralLexer extends LexerBase {
    */
   public PyStringLiteralLexer(final IElementType originalLiteralToken) {
     myOriginalLiteralToken = originalLiteralToken;
-    myIsTriple = PyTokenTypes.TRIPLE_NODES.contains(myOriginalLiteralToken);
   }
 
   public void start(@NotNull CharSequence buffer, int startOffset, int endOffset, int initialState) {
@@ -85,6 +84,8 @@ public class PyStringLiteralLexer extends LexerBase {
     assert (c == '"') || (c == '\'') : "String must be quoted by single or double quote. Found '" + c + "' in string " + buffer;
     myQuoteChar = c;
 
+    myIsTriple = (buffer.length() > i + 2) && (buffer.charAt(i + 1) == c) && (buffer.charAt(i + 2) == c);
+
     // calculate myEnd at last
     myEnd = locateToken(myStart);
   }
diff --git a/python/src/com/jetbrains/python/psi/impl/PyBuiltinCache.java b/python/src/com/jetbrains/python/psi/impl/PyBuiltinCache.java
index 64382fa698dd..b545290c13c6 100644
--- a/python/src/com/jetbrains/python/psi/impl/PyBuiltinCache.java
+++ b/python/src/com/jetbrains/python/psi/impl/PyBuiltinCache.java
@@ -172,7 +172,7 @@ public class PyBuiltinCache {
   }
 
   public boolean isValid() {
-    return myBuiltinsFile == null || myBuiltinsFile.isValid();
+    return myBuiltinsFile != null && myBuiltinsFile.isValid();
   }
 
   /**