Upgraded a Blu-ray to a 4K and want to update my collection. I am attempting to remove the disc from my collection, but the software just freezes, crashes and shuts itself down every time. This is the only item in my collection this is happening on.

Specifically, it's X-Men: Days Of Future Past UPC Code 024543-962700 and the child Disc ID CF0B-162B-7D7C-2764

Any suggestions on how to get these items out of my collection if the software won't let you?

No luck 

I don't know if this is part of the problem, but I have noticed that one of the discs in this collection, the Disc ID listed above, is listed as the parent to the collection itself. That's not usually the way this should work and no idea if it's just coincidence or not that this is the only one like this and also the only one that I can't remove.

That worked. One of the 2 items in that set remained despite definitely not selecting it, but without the other there, it actually let me remove that other one on the restored database.