We had the same problem.  We called EasyAcct tech support and was told that we had a "root" virus and to call our IT person.  Well I am the IT person so that was useless.  After doing a good bit of troubleshooting we finally determined the problem to be the .TA files (1099 e-file).  We had to remove the files and create new transmission files.  After resolving our problem I did a Google search and found the following article:

https://proconnect.intuit.com/support/en-us/help-article/electronic-filing/information-return-system...

I guess I should have googled it to begin with.  Seems like tech support would have known about the article at least.  I mean it's dated last July and the title describes the problem exactly so you would think they are familiar with it by now.  Anyway I hope this helps someone.