Just opened a solution containing a web project and one class library project. This is an existing solution, and is our main product, and ReSharper has always worked well with it. Now, I get 100% CPU, crashes, etc. I'll soon have to back up to build 259. OTOH, this is the first time I've had to run away from a build of yours, so, "good work". Build260, VS2003 JetBrains.ReSharper.Util.InternalErrorException: Unknown tag:47 An exception has occurred ---> JetBrains.ReSharper.Psi.ExtensionsAPI.Caches2.SerializationError: Unknown tag:47 at JetBrains.ReSharper.Psi.CSharp.Impl.Cache2.CSharpCacheProvider.ReadPart(Byte tag, IReader reader) in c:\Agent\work\ReSharper2.0\src\Psi\src\cSharp\impl\cache2\CSharpCacheProvider.cs:line 55 at JetBrains.ReSharper.Psi.ExtensionsAPI.Caches2.Part.ReadTree(IReader reader, IPartReader partReader, Part node) in c:\Agent\work\ReSharper2.0\src\Psi\src\ExtensionsAPI\Caches2\Part.cs:line 105 at JetBrains.ReSharper.Psi.ExtensionsAPI.Caches2.Part.ReadTree(IReader reader, IPartReader partReader, Part node) in c:\Agent\work\ReSharper2.0\src\Psi\src\ExtensionsAPI\Caches2\Part.cs:line 107 at JetBrains.ReSharper.Psi.ExtensionsAPI.Caches2.Part.ReadTree(IReader reader, IPartReader partReader, Part node) in c:\Agent\work\ReSharper2.0\src\Psi\src\ExtensionsAPI\Caches2\Part.cs:line 107 at JetBrains.ReSharper.Psi.ExtensionsAPI.Caches2.Part.ReadTree(IReader reader, IPartReader partReader, Part node) in c:\Agent\work\ReSharper2.0\src\Psi\src\ExtensionsAPI\Caches2\Part.cs:line 107 at JetBrains.ReSharper.Psi.ExtensionsAPI.Caches2.Part.ReadTree(IReader reader, IPartReader partReader, Part node) in c:\Agent\work\ReSharper2.0\src\Psi\src\ExtensionsAPI\Caches2\Part.cs:line 107 at JetBrains.ReSharper.Psi.ExtensionsAPI.Caches2.Part.ReadTree(IReader reader, IPartReader partReader, Part node) in c:\Agent\work\ReSharper2.0\src\Psi\src\ExtensionsAPI\Caches2\Part.cs:line 107 at JetBrains.ReSharper.Psi.Impl.Caches2.SymbolCache.SymbolCache.LoadFilePart(IReader reader) in c:\Agent\work\ReSharper2.0\src\Psi\src\impl\caches2\symbolCache\SymbolCache.cs:line 435 at JetBrains.ReSharper.Psi.Impl.Caches2.SymbolCache.SymbolCache.LoadSourceCache(IReader reader) in c:\Agent\work\ReSharper2.0\src\Psi\src\impl\caches2\symbolCache\SymbolCache.cs:line 353 at JetBrains.ReSharper.Psi.Impl.Caches2.SymbolCache.SymbolCache.LoadFromStream(FileStream stream) in c:\Agent\work\ReSharper2.0\src\Psi\src\impl\caches2\symbolCache\SymbolCache.cs:line 937 at JetBrains.ReSharper.Psi.Impl.Caches2.SymbolCache.SymbolCache.Load() in c:\Agent\work\ReSharper2.0\src\Psi\src\impl\caches2\symbolCache\SymbolCache.cs:line 973 at JetBrains.ReSharper.Psi.Impl.Caches2.CompositeCache.Load() in c:\Agent\work\ReSharper2.0\src\Psi\src\impl\caches2\CompositeCache.cs:line 44 at JetBrains.ReSharper.Psi.Impl.Caches2.LoadCacheJob.Do() in c:\Agent\work\ReSharper2.0\src\Psi\src\impl\caches2\PsiCacheManagerImpl.cs:line 248 at JetBrains.ReSharper.Psi.Impl.Caches2.CacheUpdateThread.Run() in c:\Agent\work\ReSharper2.0\src\Psi\src\impl\caches2\CacheUpdateThread.cs:line 102 — End of inner exception stack trace — at JetBrains.ReSharper.Util.Logger.LogExceptionEx(Exception, String, Boolean) in c:\Agent\work\ReSharper2.0\src\Util\src\Logger.cs:line 327 column 9 at JetBrains.ReSharper.Util.Logger.LogException(Exception) in c:\Agent\work\ReSharper2.0\src\Util\src\Logger.cs:line 339 column 5 at JetBrains.ReSharper.Psi.Impl.Caches2.CacheUpdateThread.Run() in c:\Agent\work\ReSharper2.0\src\Psi\src\impl\caches2\CacheUpdateThread.cs:line 111 column 11