Constant crashing with FCP, even when it starts up

The only thing is the crash logs that stands out to me (and I am no expert) is:

Crashed Thread: 14 BGTask: FFEffectLibraryThumbnailRequestManager

That tells me that one of the effects has a bad thumbnail, which is true. It's not an effect I use super often, but it is in my Favorites section and I access my Favorites often, so that lack of thumbnail may have caused issues somehow? I went ahead and resaved the effect and it has a thumbnail now, so we'll see.

Drive is indeed APFS. It's a 4TB drive with nearly 1TB remaining, however this issue doesn't seem to be related to that as it can have over 3TB remaining and it still happens.

System drive has 2.43 TB available (out of a total of 4TB).

Etrecheck report is attached.

To answer one question: This has affected multiple libraries and projects living on different SSDs. I used the Coremelt uninstaller to try to uninstall their stuff but it still appears in FCP under the C2 category. Launching their app says I have nothing of theirs installed yet there it is.

Joe -

I went ahead and deleted all generated files and I'll see how that goes this evening. I went ahead and did the other steps anyway. Nothing needed repair during the repair and verify. My FCP Crash Logs for the past 24 hours or so

Upon importing the XML into a blank Library, I was greeted with this error screen (I didn't try to edit with it):

[Edited by Moderator]

OK I downloaded and ran the Coremelt Remove Everything Tool (I quit FCP first), yet C2 SliceX 4 and TrackX 4 still exist within FCP when I reopen it, though they do not function. Screenshot attached. How do I completely get rid of them?

Here's the XML file I made.

I haven't, they are generally very, very good drives. However I do have two of them, one 2TB and one 4TB. I usually create a new Library on the one that has the most available space at the time as that gives me a non-urgent window to backup the Library to a spinny drive. I transferred this particular Library from the 4TB to the 2TB the other day just to see if it would make a difference, and it didn't. I don't really have any other places to put the Libraries except the main drive. And this current Library is 850+GB. I could get away with it for testing I suppose since i have over 2TB of free space.

OK here is a trace file. It was for a different soft freeze, it hung on "Preparing files for export" or some such verbiage and had to be quit via Activity Monitor. I'll keep scanning for the other soft freeze though.

FCP export hang for no reason

Activity Monitor reports "Apple" for kind in regards to FCP, and I'm currently using a single monitor. It's a current gen Apple Studio Display connected via Thunderbolt. I don't have any audio things connected except an analog out cable (RCA 1/8" minijack) that takes the audio to my AVR.

The apps I usually have running concurrently with FCP as I work are:

Firefox

MicroSoft Edge

Mail

Messenger

Messages

Discord

Sometimes I'll open Photoshop

I did encounter another problem that happens maybe a few times a week for me, since the fun never ends. Dragging an Apple-made effect like Gaussian Blur or Drop Shadow onto a still PNG image with transparency gives me this exciting prompt. Restarting FCP fixes this and lets me apply the effect. Tracelog of this happening

Hmmm I don't see Core Video under the Intel list any more, or even the "Apple" list. Core Audio is under the Intel list though. I'll keep an eye out for it and check if FCP starts acting funny to see if it pops up again.