MacOS – Xquartz crash infinite loop in Mountain Lion

I'm trying to get Xquartz to work in Mountain Lion, but when I click it, it starts up, then crash, then starts up again etc. It loops like this until I reboot or logout.

My console says this for every loop:

    8/15/12 10:00:21.806 PM org.macosforge.xquartz.startx[14953]: lockfile: Sorry, giving up on "/var/folders/vr/6swz_qtn60q0ld9lp_pbdqk80000gn/T//font_cache.lock"
8/15/12 10:00:21.806 PM org.macosforge.xquartz.startx[14953]: font_cache is already running.
8/15/12 10:00:21.806 PM org.macosforge.xquartz.startx[14953]: If you believe this to be erroneous, please remove /var/folders/vr/6swz_qtn60q0ld9lp_pbdqk80000gn/T//font_cache.lock.
8/15/12 10:00:21.830 PM org.macosforge.xquartz.privileged_startx[14842]: lockfile: Sorry, giving up on "/opt/X11/var/run/font_cache.lock"
8/15/12 10:00:21.831 PM org.macosforge.xquartz.privileged_startx[14842]: font_cache is already running.
8/15/12 10:00:21.831 PM org.macosforge.xquartz.privileged_startx[14842]: If you believe this to be erroneous, please remove /opt/X11/var/run/font_cache.lock.
8/15/12 10:00:21.893 PM org.macosforge.xquartz.startx[14953]: xauth:  file /Users/gav/.serverauth.14954 does not exist
8/15/12 10:00:21.953 PM org.macosforge.xquartz.X11.stub[14994]: Xquartz: Unable to locate waiting server: org.macosforge.xquartz.X11
8/15/12 10:00:21.956 PM org.macosforge.xquartz.X11.stub[14995]: Xquartz: Starting X server: /Applications/Utilities/XQuartz.app/Contents/MacOS/X11 --listenonly
8/15/12 10:00:22.305 PM SIMBL Agent[11494]: warning: failed to get scripting definition from /Applications/Utilities/XQuartz.app; it may not be scriptable.
8/15/12 10:00:22.306 PM SIMBL Agent[11494]: eventDidFail:'tvea' error:Error Domain=NSOSStatusErrorDomain Code=-600 "The operation couldn’t be completed. (OSStatus error -600.)" (procNotFound: no eligible process with specified descriptor) UserInfo=0x4001afc60 {ErrorNumber=-600} userInfo:{
    ErrorNumber = -600;
}
8/15/12 10:00:22.307 PM SIMBL Agent[11494]: eventDidFail:'tvea' error:Error Domain=NSOSStatusErrorDomain Code=-1701 "The operation couldn’t be completed. (OSStatus error -1701.)" (errAEDescNotFound) UserInfo=0x4001d7200 {ErrorNumber=-1701} userInfo:{
    ErrorNumber = -1701;
}
8/15/12 10:00:23.956 PM org.macosforge.xquartz.startx[14953]: /opt/X11/bin/xinit: XFree86_VT property unexpectedly has 0 items instead of 1
8/15/12 10:00:24.064 PM org.macosforge.xquartz.startx[14953]: /opt/X11/bin/xinit: connection to X server lost
8/15/12 10:00:24.065 PM org.macosforge.xquartz.startx[14953]: 
8/15/12 10:00:25.066 PM org.macosforge.xquartz.startx[14953]: waiting for X server to shut down 
8/15/12 10:00:25.113 PM org.macosforge.xquartz.startx[14953]: waiting for X server to shut down 
8/15/12 10:00:25.114 PM com.apple.launchd.peruser.501[129]: (org.macosforge.xquartz.startx) Throttling respawn: Will start in 7 seconds

I don't know anything about Xquartz, so I'm not sure how to diagnose the problem.

I'm using Xquartz 2.7.2 found here http://xquartz.macosforge.org/landing/