I had a batch of 62 corrected 1099-MISCs for which the .txt file was in the wrong format.
It had the payer record after each payee record rather than once at the beginning.
They were no help in resolving it. I manually edited the file until it was finally accepted by FIRE.
I periodically exported a new replacement file from the Information Return System to see if the problem had been corrected. It never was. 
VERY frustrating.

Plus, the recipient forms did not have the corrected box checked!