My nav has shown some strange behaviour too. Did a lot of research, software upgrades etc. but nothing ever worked. The nav menu was missing from the display, and the cd unit itself kept spitting the discs back out at me even though it's light seemed to indicate it was working.

Anyway all the research lead me to the conclusion that the cd unit was faulty. I haven't replaced it because they're so expensive. I just use a Garmin suction cupped to the windscreen.

__________________
2001 X5 4.4i