[PyQt] Segfaulting in PyQt-4.6

[jonnobleuk at gmail.com]

I have a bit of a problem. My application worked fine in ver-4.5.* but every 
time I start it in 4.6 the app fails to start and all I see is 

    "Segmentation fault (core dumped)"

I've tried to debug the app in Eric IDE but all I get is 

    "The program being debugged terminated unexpectedly"

Has anything critical changed between 4.5 and 4.6? How do I go about debugging 
my application?

Thanks for your time.

Jon