Hi , i just had the same problem with the -1.#QNAN in a 21364 EZ-Kit working on the Block Based TalkThru .
I am trying to run 2 rfft512 and 2 ifft512 and while in the first time running the processBlock routine it is working as expected , the second time entering , after the first ifft512 it is filling the output of the ifft with -1.#QNAN.
Is it the same problem with that ? And if it is , how is it possible to solve in this occasion?