Ron Marcus, I have migrated one of my projects from 18F252 to an 18F2620 and the only things I changed were the A/D configuration settings as the definitions are a bit different. I use 38.4k baud interrupt driven receive and transmit routines enabled continously. Recheck the data sheet and make sure you have all of the interrupt registers set correctly and the USART registers set correctly.

Dave Purola,
N8NTA