I have a similar problem here using the XQuartz app (not the Apple X11.app) under 10.7.3 with an XCode 4.3 install and latest fink for the 4.3 XCode. In this case, the X11 crashes at startup and won't work at all. It will start fine if I comment out the DYLD_LIBRARY_PATH env setting in the .cshrc file. The relevant parts of the crash report appear to be:
Dyld Error Message:
Library not loaded: /opt/X11/*/libfreetype.6.dylib
Referenced from: /opt/X11/*/libXfont.1.dylib
Reason: Incompatible library version: libXfont.1.dylib requires version 15.0.0 or later, but libfreetype.6.dylib provides version 13.0.0
...
0x100463000 - 0x100477fe7 +libgcc_s.1.dylib (??? - ???) <36CE1262-00E7-3418-9DDE-8432F434D3F6> /Applications/FMRI/*/libgcc_s.1.dylib
0x100484000 - 0x10050dfff +libfreetype.6.dylib (13.2.0 - compatibility 13.0.0) <C9B98046-1B49-3B9D-ACA1-3770F1299B44> /Applications/FMRI/*/libfreetype.6.dylib