Thanks Darrel,
Now I'm a bit confused.... Will this allow me to still use DT-Ints for the low-priority interrupts? The actual servo-loop code is, as I said earlier, triggered as a low priority interrupt by TMR2 and I also have a second low priority interrupt for handling USART comms (which isn't used during the tests I've made so far).

Does the RETFIE FAST automatically restore the STATUS, W etc registers or is that not needed due to the "shadow regs"? As you can see I really suck at the low level stuff...

Before seeing your message I tried changing the RollOver ISR to type ASM but it didn't make much difference. Up to 20kHz it works fine, above that it starts to fall apart and I can't really see why.

Your assistance is much apprecited, thanks!

/Henrik.