I ended up messing so much around with my games that something got mixed up, so now I am rebuilding them from scratch, putting in the latest additions too. When I am done, I am going to be scanning about 2309 entries, and test it with beta60.
With beta59 I concluded, that it crashed when scanning 2-level structures and having a second level dir with more than 500 subdirs which contained slaves. After that I tried other combinations and number of entries, keeping dirs with less than 500 entries in each but it did not crash on me.
Is this 500 entries per subdir limit still in beta60?
I will let you know my results when I am done rebuilding and testing.