Ok, to make a distinction so we know we talk about the same thing
A data file is a file with data edits only and does not need to be verified
A competition file is a file with a competition in it, and possibily data, and needs to be verified.
The issue with the crashing for competition files has been reported and will be locked at.
On the date file front, I am seeing no issue with a 4800 change file that I am currently running and have imported from FM23 to FM24.
No, what you are saying that anay editor file crashes, it is not true. No entirely sure what the issue is with your file, but since I have no idea what the exact change is, it is hard to judge.