I've only had a quick look at Blink8X, and I think:

1. It's a PB program not PBP so you may get problems.
2. The program does not have any of the usual 'set up' commands:
. Xtal frequency.
. Include files.
. Make PortA digital etc.
3. It's a bit unusual to start learning PBP on a PIC18F8722 and doing it in MPLAB. Most people choose something like an PIC16F84A anf use MCS.

Regards Bill Legge