Thanks for the responses. I've tried adding/removing the traffic layer a few times, and I'm pretty sure I specified a cache db up front once, but I'll try again to verify. Since noone else has had this problem, it sounds like it's more likely some strange setting I have in Maemo Mapper, but I'll give all of the suggestions a try later.

Either way, thanks a lot for working on this feature. It's very important and I appreciate the effort