Has anyone had any experience with using Qt Jambi and install4j?

My main issues are with Linux (specifically Red Hat) and Mac OS X.

When I run my installer on Ubuntu it installs fine and the launcher works like a dream, but with Red Hat I'm finding the same launcher is crashing complaining about problematic frames within the Qt native code. Attempting to launch the jar file manually crashes too.

With OS X I've found that the launcher I've created works fine with my personal MacBook Pro but the brand new MacBook we've just bought for the office won't launch the application. The launcher crashes but running the jar file manually from the command line works. I know about the -XstartOnFirstThread business on OS X.

Has anyone had any experience (good or bad) with install4j and Qt. Any common pitfalls or helping points would be much appreciated!