Something is strange.

I just tried your code for giggles and this is what happened.
Executing: "C:\PBP\PBPW.EXE" -ampasmwin -oq -z -p12F675 "C:\MAC\PIC PROGS\TEST\12f675.bas"
PICBASIC PRO(TM) Compiler 2.50c, (c) 1998, 2008 microEngineering Labs, Inc.
All Rights Reserved.

ERROR: RAM END must be defined.
ERROR: RAM BANKS must be defined.
ERROR: No LIBRARY statement or LIBRARY parameter.
ERROR: No LIBRARY statement or MACRO parameter.
ERROR: Unable to open file PBPMAC.INCHalting build on first failure as requested.
BUILD FAILED: Tue Sep 15 20:40:41 2009
It is not your code, something else is the matter. A lot of folks seem to be having problems with this chip....