Heya, some more info as a followup on this:
I've created a completely new user on the other machine, i.e., no stale preferences or anything from an old kdenlive version. Segfaults on the new machine every time. Also build the exact same versions that I have running locally (and that do work for me) -- they work on my local machine, but also segfault on the other machine. No idea what's going on. Any help is greatly appreciated. Cheers, Johannes