Hi KidPaddle, I finally got the gdb working. It gives me this result

Code:
Program received signal SIGSEGV, Segmentation fault.
0x0006e70c in __pthread_initialize_manager () at ../MPEGerror.h:34
34      ../MPEGerror.h: No such file or directory.
        in ../MPEGerror.h
Does this mean anything to you? :-)
cheers,
Paul