I have an Ae file that freezes up Ae every time I open it, even the autosave files freeze it up. The problem is specific to one project. All my other Ae project files open just fine. Never had this issue before today. I have coworkers that can open the file just fine, on the same version of Ae. Same exact hardware and software build as well. I can even open it on my laptop, which has an old version of Ae, just can't open it on my Mac Pro. I tried reinstalling the current and old version of Ae. Still won't open. See screenshot below. It looks like a dialogue box starts opening and freezes before it gets past this point. I get the color wheel and have to force quit. Any thoughts?
Try Opening After Effects, set Caps Lock on so nothing will render, then Import the problem Project file and open the compositions one at a time. Do not Open the AEP, import it. The caps lock will prevent a comp from rendering a preview.
When you find the problem comp, repeat the process but turn off the effects on the layers one at a time until AE does not crash.
You could also have some corrupted footage in the project so rename the directory with the footage and try replacing the files one at a time.