Could you post the output of the no-response from 0x00 bit? A good start would be the entire output of obdgpslogger when you add the "-p" flag.
The 64-bit stuff... erm, I don't know. I don't have a 64-bit mac :-(. Could you post the entire build log for obdgpslogger on that machine? I work with fltk 1.3, I haven't tried 2.0 yet.
I did give one short answer in your other thread about the .dylib, but I don't know if it'll resolve your problem, given the huge 64-32-bit-mess that appears to be going on.