It think it's not only hanging after deleting files but after working in f-spot a few minutes...
But this was just displayed in the terminal after deleting a few photos (and f-spot hangs): Xlib: unexpected async reply (sequence 0x39c99)! -- f-spot hangs after deleting (from drive) a few pictures https://launchpad.net/bugs/63379 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs