I’ve found some new information that may help you guys fix my problem:
The project is very large (11 MB). This is also the only project that has this issue.
Also noteworthy is that it only happens to specific effects. The failing effects are all located in the Plug-Ins folder of the Support Files, or they are Red Giant (unless it’s Universe). Everything else works fine.
However, effects that are in that folder that I’ve used in the project before (like CC Flo Motion) work completely fine.
The errors given are either Error 1114 (48:46) or an Invalid Filter error (25:3).