Ok, just installed your latest build again and here is the error-report I get, by the way I'm using a MBP if that's any help.
Process: amule [2279]
Path: /Applications/aMule.app/Contents/MacOS/amule
Identifier: org.amule.aMule
Version: ??? (???)
Code Type: X86 (Native)
Parent Process: launchd [102]
Date/Time: 2008-03-20 11:31:05.774 +0100
OS Version: Mac OS X 10.5.2 (9C7010)
Report Version: 6
Exception Type: EXC_BREAKPOINT (SIGTRAP)
Exception Codes: 0x0000000000000002, 0x0000000000000000
Crashed Thread: 0
Dyld Error Message:
Library not loaded: /opt/local/lib/libpng12.0.dylib
Referenced from: /Applications/aMule.app/Contents/MacOS/../Frameworks/libwx_macu-2.8.0.dylib
Reason: image not found