I am using VisualDSP 5.1.2 with the rfft_rf16 library function with my BF561. Most of the time it works just fine. But I've run into an issue where using the v5 .asm function I get an unknown fatal exception. When I switch back to the regular rfft_fr16, I don't get the exception but I get bad output data instead. Do you have some tips of what could be happening to output bad data in the regular function and a fatal exception in the v5 function? Have you seen that before? Can you give me some idea of what I might be doing to cause that?