creates a non-working encoded file if enabled TenporalDegrain filter

[Selur]

Without MT, Avisynth only uses one thread, thus it's not threading and probably not a memory problem.
Did you try to disable your desktop anti virus / firewall solution ? (this sounds to me like either something is interfering with Avisynth)
Also does this only happen to you with one file or can you reproduce it with others (of a different format etc.) too?

Cu Selur