The update/verification completes fine, but when I click the play button, I get this:

zak@blackbox:~$ .vendetta/update.rlb
[xcb] Extra reply data still left in queue
[xcb] This is most likely caused by a broken X extension library
[xcb] Aborting, sorry about that.
vendetta: ../../src/xcb_io.c:575: _XReply: Assertion `!xcb_xlib_extra_reply_data_left' failed.
Segmentation fault