Brandon Allbery <allbery@kf8nh.com> writes:
I have my HDTV hooked up for occasional use as a second monitor, positioned to the left of my iMac's internal screen (iMac is the master screen with the menubar and dock). As it turned out, the mini- DVI connector had worked its way loose, so when I started the new X11 it knew only about the internal display. When I fixed the connector, all my X11 windows moved to the HDTV, then X11 froze. I was able to move the windows back but not to do anything else with them. Interestingly, quitting X11 worked, so it wasn't completely frozen even though things like motion events clearly weren't being responded to (admittedly I couldn't say if they weren't being delivered or if the resulting window updates weren't happening; I need to get xscope and/or xmon going here).
That last bit seems quite like a freeze that I've seen occasionally in recent Xquartz beta versions. The couple of times that I saw it were not during monitor add/remove events, but being able to do menu actions matches up. If you can reproduce it (so far I cannot), try the workaround of hiding and re-exposing X11 to see if it comes back to life. regards, tom lane