I just tried exactly that for my two primary profiles.
Geocaching profile - Topo 2008 was Enabled when I re-started the GPS
Automotive profile - Topo 2008 was NOT Enabled when I re-started the GPS
Very odd indeed!
Although, I always have Topo 2008 Enabled, so it's never been an issue for me.
I suppose, if you always have it turned off, you could remove the Topo 2008 data...right?
I have the same problem with the 3.00 version - whenever I turn on my Colorado, the built-in map ( for me it is WW DEM Basemep NR ) is turned on. And for sure it is switched off when I switch off the GPS.
But this appears just in the profile which is selected in the time of switch off. I tried to remove the built-in map as I don't use it at all and it seems it works fine. I will test it more this weekend.