Thanks for the quick replies!!
When I fired up Cura this evening, it walked me through the configuration wizard like a brand new install (I have version 15.04.4 now). I modified a few settings per my PrintrBot documentation and then loaded the model file I first had problems with. Everything loaded fine and it is printing as I'm typing. Go figure! I am printing via USB cable (no Wifi capability on this printer) but I will try using the micro SD card at some point.
Thanks for the help! I'll keep working with it.