Hello. I was listening to an audio file the other day, not touching the Bookport, when, it said:firmware error in app.c at line 737, press the 0 to reset book port This was with Firmware 2.1.0.28, after 4700 minutes, or about 78 hours, of spoken minutes time. I'm not going to worry about this occurrence, but thought I'd mention it, for the record, so that if others encounter it, they'll know it happened to others. By the way, pressing 0, reset the bookport to factory defaults, I plugged in my preferences again, and continued on my audio way, so I don't think this was a problem with my flash card. -Brian