It appears that it was the snapweb snap causing the problem. I tried reinstalling all of my snaps from scratch and realized that my previous version of snapweb was from the beta channel. This time I installed the snapweb stable release and now everything works again. Don’t know why the beta caused segfaults in the other snaps, maybe shared libs?
Refresh didn’t catch my mistake of course, anyone else having this issue should do a snap delete snapweb and then snap install snapweb to get the stable release.