I have an application that has caused me much trouble the last few days. I am the developer and maintainer of the FS2_Open Launcher for OS X. Recently, I made an update, which is supposedly not working. I have tested it on my machine (Intel OS X 10.5.2) and 2 G4 machines running 10.4.11. The application is running fine. But other people in some forums tell me that the application won't even start! After suggestions about deleting preferences, etc, I came to the conclusion that they indeed have a problem. One of them has posted the below code taken from the console.app: Code: Identifier: com.soulstorm.MMST2_3 Version: ??? (3.0.5b) Code Type: X86 (Native) Parent Process: launchd  Date/Time: 2008-05-22 18:58:40.948 +0200 OS Version: Mac OS X 10.5.2 (9C7010) Report Version: 6 Exception Type: EXC_BREAKPOINT (SIGTRAP) Exception Codes: 0x0000000000000002, 0x0000000000000000 Crashed Thread: 0 Application Specific Information: *** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'Invalid parameter not satisfying: aString != nil' As you can see, this is a generic error, and I can't figure out where it is! I searched for aString in my application, but those parts of the application were working fine before the update, and I haven't changed them since then! So, what I want now is: - Please, test the application. I only want to know if it starts up. If the application manages to launch, it will be OK. - Can anyone tell me if there is any way of spotting a bug that I cannot even reproduce? You can download the test application here.