When I got Studio going again, I tried the crops again in the full page editor and it worked fine.
I also find a mystery here.
The fact that you have a new machine implies that you did a clean install of both Qimages. That begs the question, Have you been carrying forward, copying, all the saved jobs, setups, filters, etc from the original install on the original machine?
There has to be something that is common to all three machines/installations.
I run a Studio and an Ultimate. They share the same folders and all the common files containing old stuff created since the beginning of time.
I would suggest that you copy all the folders that you see in the attached screen snap to a safe location, and then delete all those yellow folders.
Reinstall Qimage Ultimate which should make a new set of folders,,, all nice and clean.
You can put the Raw Cache folder back since that is used by Ultimate only, and you stated that it crashed even with Studio.
Then play Sherlock Holmes and convince yourself that it no longer happens.
Then add the contents of one of those old folders at a time until you return the problem.
Investigate that folder...
As Sherlock has said, "How often have I said to you that when you have eliminated the impossible, whatever remains, however improbable, must be the truth?"
Fred