Sorry to jump in but that picture shows you using 'Yahoo Satellite' for map tiles (black dot to the left). Changing to another option is merely a case of tapping on the relevant choice and the dot should switch when you next look at it.

I found the first download took some time. I also found that once I had a corrupt tile set and had to remove the files from my storage area to stop Maemo Mapper having a fit.

Hope this helps some!