Yes, we have received that message before and it was a browser issue with the way the files submit to FinCEN. It's not necessarily anything specific on your part.
Here is our workaround to this situation - we prepare the reports in a FireFox browser, and then submit the reports in an Internet Explorer browser. We have also found that if you are creating a new filing, it will create, prepare and file the report for you in Internet Explorer, however if you are using saved pdf's, that's where we prepare the reports in FireFox, then do the actual submissions in Internet Explorer.
_________________________
CAMS
CAFP