It may also be worth clearing the preference files. I believe they are retained even if you remove and reinstall Archicad. Archicad will recreate them on launch but you will lose all of the file history from the Start Archicad window and also your work environment settings.
Lee Hankins ArchiCAD 4.5 - Archicad 26UKI Apple Silicon 4032 macOS Ventura (13.1)
I attempted all the things you mentioned. Unfortunately it did not correct the issue. The one thing I can't perform is Aborting Loading Library Parts, as the entire application is frozen and I can't click on anything. The only way is to Force Quit Archicad 26 😞
Is there a way to better determine if a 3rd Party Application could be causing this? I work for an IT MSP, and this is a client computer I'm attempting to fix. The computer has so many applications installed on it, I have no idea where I'd even begin.