I can reproduce the problem on my MacBook3,1 running 10.6.1 with Xquartz 2.4.1_alpha3 (with and without X11.bin-1.7.0.901). Doesn't matter if I use the internal trackpad or the external USB mouse. As soon as I switch away from X11 the input seems to be frozen and not being restored when switching back to X11 (that even holds for the quartz title bar of the X11 windows -- there's no interacting with the title bar or the three shiny buttons). But I noticed that the input can be restored if one minimizes (cmd+m) the X11 window and restores it from the Dock. Could that at all be a problem related to the WindowServer-X11-brigde instead of X11 itself?
Jeremy, I can reproduce exactly the same behavior as Heiko has described it above - X11 can be reactivated after minimizing and restoring it. That works for alpha 2 and 3. ciao christof -- public key www.hfph.mwn.de/~chwolf/chwolf.asc Please respect my privacy and do not make my contact information available to third parties.