Ive had this alot this year.   

In the EFcenter highlight the files, then instead of using Receive Acks, choose Update Acks of selected returns.

That did work Lisa.    Thanks a ton!!!!!   You get a gold star!   Don't know why I didn't just try that rather than the all in once update I normally do.   Have a wonderful final 13 of tax season.

Its weird, I'll transmit a big batch at a time but when I receive Acks only some of them come through, I have to highlight and update acks for them, then the rest come through, I dont get it.