I've just uploaded 2.5.1_rc2 (Snow Leopard only for now), and you should get an update notification if you're using one of the earlier betas or subscribed to the beta sparkle stream. http://static.macosforge.org/xquartz/downloads/SL/XQuartz-2.5.1_rc2.dmg The main reason for pushing this out now is to address the libpng vulnerability I mentioned earlier this week. A handful of other bugs have been fixed including a couple corner case hangs and crashes. If you have any stability regressions with this update, please file a bug report (and follow up with that report). Open bugs for 2.5.1 (both may be fixed, but awaiting verification): Hang in X11 http://xquartz.macosforge.org/trac/ticket/407 X11 crash http://xquartz.macosforge.org/trac/ticket/415 Thanks, Jeremy