fast timer block other interrupts?

[flipper_md]

Hello

I have a pretty fast timer(1) running to draw graphics(POV), interrupt about every 1msec on a 48Mhz PIC (18F2550).
I'd like to be able to change some parameters while this run, but so far I just can't make it respond. Currently testing with DT Instant Int.
I have tried two type of interrupts to stop the Timer1 processing, INT2 and RX_INT, but they get ignored, even if I put a stopper in the Timer routine!?

This is the stopper I have in the Timer1 routine:

if INTb2_RxInc = 1 then   ; stop INTERUPTS if incoming Rx
  Timr1Start = 0
@   INT_DISABLE   INT0_INT     
@   INT_DISABLE   INT1_INT     
@   INT_DISABLE   TMR0_INT     
@   INT_DISABLE   TMR1_INT  
  ledRFpriority = 1
@  INT_RETURN   ; Return to program, (humm that looks clever for instants Ints!!)  
  ; Should add a watch dog for restart
  endif

my last resort will be to have a 12F PIC killing the 18F with it's MCLR pin...but that feel weird.