v1.5 crashes immediately on launch on my Mac.

v1.4.1 doesn't

Crash Log:

Process: ShiftIt [399]
Path: /Applications/ShiftIt.app/Contents/MacOS/ShiftIt
Identifier: org.shiftitapp.ShiftIt
Version: ??? (???)
Code Type: X86-64 (Native)
Parent Process: launchd [130]

Date/Time: 2011-02-03 13:19:19.038 +0000
OS Version: Mac OS X 10.6.6 (10J567)
Report Version: 6

Exception Type: EXC_BREAKPOINT (SIGTRAP)
Exception Codes: 0x0000000000000002, 0x0000000000000000
Crashed Thread: 0

Dyld Error Message:
Library not loaded: /usr/X11/lib/libX11.6.dylib
Referenced from: /Applications/ShiftIt.app/Contents/MacOS/ShiftIt
Reason: image not found

Binary Images:
0x7fff5fc00000 - 0x7fff5fc3bdef dyld 132.1 (???) /usr/lib/dyld