Hi, I've got some code in C# that embeds python as an interpreter using Python.NET. This code executes various python scripts to calculate values and returns. I'm calling AcquireLock() and ReleaseLock() before and after each use of the PythonEngine. The code works flawlessly in a WinForms test app. But if I try to run the code from an ASP.NET web application or a web service, sometimes, the call to AcquireLock waits indefinitiely. Stepping through a debugger shows that first time I call it, it works, and then ReleaseLock() also works. But then a second call to AcquireLock hangs. This problem is only there if I execute the code from a web application. Is this a known issue? Is there any work-around for it? If its a bug in the Python.NET code, then maybe I can look at possibly fixing it. Or could it be a fundamental problem with the Python interpreter itself? Thanks, Haran