Problems with macstumbler on Intel MacBookPro

I'm having problems with macstumbler on an Intel MacBookPro

Most times the application shuts down and wants to send a report to Apple.
(I can post the error report but only if it will help as the text is a bit
long)

Other times it will load but not seem to interface with the wifi hardware in
the Mac.

OS 10.4.? which worked with the G4 Mac but not with the Mac BookPro. (160 G
HDD, 2G of memory) All the latest .Mac up dates have been made.

TIA