Please try renaming the source and save folders. I have seen a few cases where the Adobe security token for a particular folder path gets corrupted and renaming the folders fixes it. Thi smay not fix the issue. However, I have seen several cases recently where it did so it is the next thing to try.
If that doesn’t work then please try EZGS 7 and let me know if that does the same thing. I need to know if the issue is EZGS 8 specific.