These values work in the utility:
FOSC=20
SPBRG=0
20/16(0+1) = 1.250 = 1250 KBAUD


These don't:
FOSC=48
SPBRG=0
48/16(0+1) = 3.000 = 3000 KBAUD

Don't you hate 18F MCUs?

Robert