Hi,stax the attached picture can't displayed (may the fourm limited it?) that dialog look like this: ======================================================== Just-In-Time Debugging An exception 'System.ExecutionEngineException' has occurred in AVSEdit.exe. &Possible Debuggers: New Instance of Visual Studio .NET 2003 Do you want to debug using the selected debugger? &Yes &No ========================================================= My system: Windows Server 2003 std(all hotfix applied) P4 2.4,512DDR avisynth 2.5.5 + avsedit 1.0,works fine avisynth 2.5.5 + avsedit 1.1.0.0/1.1.1.1 hang avisyhth 2.5.6 + avsedit 1.1.1.3 the same results