m600i problem with cached maps

Hi,

I have problem.
It seems like GPSWatch have problem to access my memory card.
When I use GPSWatch and try to zoom I get an error message "error writing: null". This with Use Internet=Intermittent. If I download maps and use Use Internet=Never I don't see any maps.

How can I solve this?

Information
GPSWatch settings:
Distance=KM
Map source=VirtualEarth
Cache Level=Cache Min
Cache Store=FileSystem
Use Internet=Never/Intermittent (tested both but with problems)
Memory Management=Application
GPS AutoConnect=Enable

/GPSWatch/data (is created on both memorystick and phone memory)

Telephone: SonyEricsson M600i
Language=Swedish

Any help is highly appreciated

/Niklas