"Ganonmaster" said ...It is actually, i can run it flawlessly with, example, the TF models.
Make sure your computer is good enough to run SFM.
Make sure your computer's drivers are up to date.They're up to date. check.
Make sure your virus scanner is up to date. Make sure your Virus scanner isn't interfering with Source Filmmaker. Make sure you don't have a virus on your computer.Triple Checked this one. no problems.
Make sure you installed the custom models correctly. Uninstall them if necessary. Verify Cache.: (In Steam, right click SFM, select Properties, go to Local Files and click Verify Integrity of Application Cache. See if that fixes it.) Revert to an older version of SFM. (In Steam, right click SFM, select Properties, go to Betas, and select one of the older versions)I will reply about this later, since i have stuff to do right now. Also, i will try installing other ones (some from here, and others from other pages) to see if it's the models itself or a SFM problem