I'm having the same issue. I went from ProSeries18 to Basic19 as I am semi-retired now. Also had to change address and obtain a new EFIN # which I validated with Intuit. The error message for Federal reads, " Not transmitted, the selected return(s) was not successfully converted for Electronic Filing.  Open the return(s), correct any errors in Final Review, save the return(s) and re-convert for EF."  The error of state reads, " Not transmitted, ProSeries has detected a system change which invalidates the converted file contents.  Please re-convert."  I have tried 3 times and talked to Tech Support which was no help either. AAAArrrrrgggh!!!!!