For the last 1.5 days my MC did crash very often. I'm not 100% sure if it began before or after the 21.0.26 update.
The crash occures almost every time, when pressing F12 (Fill properties from filename) while having selected many entries. Even if I just select one entry and press F12, MC needs several seconds until the window appears.
Normally this windows would appear in a second no matter how many entries I have selected.
Edit: I created a new library, added some files and reproduced the problem I have described above.