What Axim do you have and why are you using Pocket divx?
I don't believe there has been an update on Pocket DivX for over 3 years (1/9/2002). There are much better programs out there. Betaplayer is probably the best:
http://betaplayer.corecodec.org/
Betaplayer plays DivX and XviD and many more audio and video formats and is very fast.