Qwt causes crash when opened with double click, but not with "open -a foo.app" on OSX

Greetings,
I'm currently using the Qt 4.8.0 beta, qwt 6.0.1 and OSX 10.7. I have a program that was working using Qt 4.7.x and qwt 5.x. Now the code compiles fine and runs, but whenever I open a window that contains qwt plots it crashes. I recently discovered that if I use the terminal to open the program "open -a foo.app" the crashing no longer occurs and the qwt plots work perfectly. I imagined this to be some environment variable that was being passed via terminal, but isn't when I double click the app bundle. To test I installed a fresh OSX 10.7 virtual machine with no Qt or qwt and performed the same experiment with exactly the same results. I should mention that qwt was built as a framework and called out in my .pro file with CONFIG += qwt. I was hoping someone might have some ideas on what exactly could be the cause. I'm having problems attaching the crash log, but I can provide it. Thanks in advance.