I have seen the same behavior. Installing the libmono-system- runtime2.0-cil package resolved it for me. I have the 64bit verion of xsel installed.
I got the solution from here http://sourceforge.net/p/keepass/discussion/329221/thread/5bdb7ee3 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1116512 Title: Double-clicking password entry from overview freezes entire system To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/keepass2/+bug/1116512/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
