I have tried to develop a photo (with about 8 total files open in the program) and usually the program crashes, since the 1.10 update (1.9 and 1.8 did not do this, even when I had over 20 files open).
Only one file is being developed at a time, and Affinity was even the only program that was open and running on the computer. I don't know how or why this is happening.