Common ground is the cause of the entire issue, I need a part of the circuit at 12v, and I'm providing 5v for the logic via a 7805.

Thanks for the clarification!

Hello, just a quick one: Will I damage the startUSB PIC (or my PC's USB ports) if I provide external power to the board while it is connected to the PC?

No problem, I am glad to be of assistance.
Pozdrav

Hello everyone!

I found a bug (i guess so) in GLCD Font Creator 1.2.0.0 - can't save on Windows 7 x64. Installed on a virtual XP, saves fine. Willing to aid in testing if necessary.