>> This pagesel method usually works.
>> Of course, are you saving PCLATH in the Interupt? Guess so.
>
>Yes, I do so, but this issue is independent from ISR.
>I have the same without ISR in my code.

Are you doing another pagesel for the next call, that happens to go to the 
lower page? If not this will send your code into hyperspace as PCLATH is NOT 
restored on the subroutine return.

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