marco
I will give you three options
1. intcon.7=0 ' I'm assuming it was set
@ Flash2Ram _buff,_String1' Get a String from flash memory
intcon.7=1
2 . examine your .lst file and determine if any of your isr routines use FSR2 or TBLPTR
if none of them do then don't worry (this is the most likely case)
3. there are two other indirect addressing pointers FSR0 and FSR1 maybe one of them would be free

as groucho would say if you don't like these I have others

this is the best I can offer without seeing your code