Over in the
other thread, TheOverseer714 suggested that the .sav file got corrupted. I came to the same conclusion, because CivAssistII refuses to load that file. (Aborts with a strange error.)
Unfortunately none of us PBEM players has enough insight into these technical details and the sav file format, but perhaps someone could investigate the file (attached to the other thread) using one of those special .sav file tools?
I don't know the format of that file, but I could imagine that the information whether one nation has a RoP with another one, is stored somewhere in the file in a boolean matrix? In this case a possible explanation would be, that the entry for "RoP between Rome and Japan" has been flipped from "false" to "true", leading to the very strange situation where these two nations now have a RoP with each other while being at war...
In any case: before continuing that game I would let some expert make a health-check of the .sav file. Perhaps the RoP table is not the only location that's broken?! This game has now been going on for almost 5 years, so a week more or less won't matter much...

Better than continuing in this "broken state" and risking more damage (up to the point where the file becomes completely un-playable).
It would really be great to see this
"True Epic" come to a worthy conclusion!
(And if the thing can really be fixed, then no one would have to replay his turn!)
Lanzelot