"Ganonmaster" said ...Yes that's unfortunately what I expected. It really disappoints me to know I will never be able to tell which models I download are going to cause problems - this is especially true of the downloads containing multiple models. The software needs some sort of extra allowance of CPU usage or something since as soon as it reaches it's limit for something similar the software doesn't even give you an error report it will just crash strait to desktop; it is extremely poor. Thank you for replying.
Source Filmmaker and the Source engine version it runs on aren't exactly bug free, so some crashes are to be expected. If loading/previewing/spawning models cause it to crash, we'd probably need to know which models to isolate the problem so you can either fix, delete or let someone else test them. Unless you sort out the models in your usermod folder, there's really nothing else to do.