Gregory,
After rebooting and rebooting, I have had terrible problems with both my HDS Gen2 and Gen2 Touch. Settings that were changed ( knots, km/h, overlays that had disappeared, needed to recalibrate the Touch etc... .
There were 2 diferent maps on the SD card, both with a description string. I had used underscores in the name of the maps. Maybe that could be a problem?