@spinachworld wrote:
And wouldn't any system/hardware/software changes affect all projects on my machine (also there haven't been any recent updates)?
Is it possible that something external is causing this, for example some specific piece of footage or file I imported is corrupted, and if so how could I determine what it is?
The answer to the first question may lie in your second question. For example, if I have something dynamically linked to an After Effects composition in one project, but not in others, and I have installed software that conflicts with that link, then a software change on my system would only affect that one project. But tracking something like that down is hard unless the change was recent and I could remember what I did.
A footage or file corruption is easier, but not easy (if that makes sense). In some cases the project file is corrupt in a subtle way that only manifests when certain conditions are met.
I do recommend that you try creating a brand-new project and then importing the problem project into it. That should eliminate a corrupt project file in most cases.
Since you've already cleared your cache (hopefully by deleting *all* media cache files and not just those "not in use"), you should try resetting your workspace or switching to a default workspace and resetting that.
If that doesn't work, then try resetting your preferences:
FAQ: How to reset (trash) preferences in Premiere ... - Adobe Support Community - 8236158
If none of those things work, then you're down to troubleshooting by pondering what is different in this project (no matter how small or insignificant) and what is different about the media in this project. The free tool MediaInfo can help with that.
Let us know how it goes.
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