I've got the same issue. Debian stable Package: citadel-server Version: 902-4
Kernel: 4.9.0-4-amd64 segfault at least if I try to log in like John wrote. But during the instrallation process too. Also during runnig citadel in the backround. Citadel is unusable for me. Tested on 2 different installations (different hard discs) and 2 different PC's (but same model).
