> Ah what a difference fresh eyes make...
> 
> After looking at my code again today I noticed I had left
> out an 'L'
> nothing complained that I was trying to write to FSR0

MPLAB has caught me like that. Something incorrect will
not produce an error, but it won't be included in the code
either. I can't think of a specific example but say you have

100 movlw 0x58
101 (an instruction not recognised but not build-fatal)
102 rrf temp

when you look at the Program Memory you'll see just

100 movlw 0x58
101 rrf temp

Put the code how it was and see what's in PM after the build

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