I had, so I uninstalled EF (by using EF uninstaller, without uninstalling CoH itself), reinstalled it from 1.3.0 complete installer I have previously (when it was out) downloaded, then installed 1.3.0.1, 1.3.0.2, 1.3.1.0, which I copied out from [main CoH directory]\EF_Updates, before uninstalling EF.
Finally, I was able to watch the replays without getting sync. error.