So the main issues I've seen reported from 2.5.0_rc1 are: $PATH should be reordered - Fixed locally Display config changes result in clipped pointer events (can't move window some places) - I know a fix, checking upstream to see if it's the best fix Xephyr and Xnest have bad keymaps - Fixed locally ... you can use these binaries: http://static.macosforge.org/xquartz/downloads/testing/Xnest http://static.macosforge.org/xquartz/downloads/testing/Xephyr System fontconfig segfaults after updating to XQuartz - The only thing this can be is a conflict in the caches. I can't really "fix" this in an XQuartz update since it's the system fontconfig crashing System X11.app starts as "default" X11. - You need to log out for that. I don't want to force logout in the installer. After logging out and back in, system X11.app won't run - This is an issue with the system X11 and the fix must come from Apple. If I missed an issue, please report it (preferably with a bug report at http://xquartz.macosforge.org). As it is now, I think I have mostly eliminated the reported issues. Thanks for testing. --Jeremy