Don't know why I need it, but this works:

Code:
FiveMicroSec:
'    LATF = LATF ^ 32     ;  TOGGLE DAC
    CNT =CNT+1
    BSR = 0
    PORTC = PORTA
    PIR1.1 = 0          ; clear the interrupt flag
@ RETFIE
I mean, I get why setting BSR=0 fixes it, just don't know why I need to.