Today, after playing many rounds, I recieved a Version Mis-Match "R65FX" on the Island Estate 2 Map.
Secure Gospics Laptop?
I have played this map so many times I can't tell you..but today..I have a version mismatch?
Any info would be appreciated... 
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If it occurs every time, I would assume you have a/ a corrupted file, b/ installed a map that screws with stuff it shouldn't, or c/ been compromised.
but that's just off the top of my head; having no wits left (got a headache) and no other useful details ^.
If the problem persists, you can also delete the offending file and the server will download the file to you.
If that proves too slow, you can get another member to X-Fire the file to you.
The 2nd option might be your best bet.
[color=yellow][SAS] 22nd E.V.R. - SAS_VET_EN4CER /[color] Virtus Disciplina Unitas
Well, seems I solved my own problem.
I tried to enter other servers and the same "Mis-Match" appeared.
The only thing I have done was to UnInstall Athena Sword, but that was a few weeks ago...
So, I re-installed Athen Sword and entered Public and Training Ground Servers with no Errors???
Wierd, but..Stranger things have happened with this Game..
Perhaps AS's uninstallation procedure modifies a file that *ordinarily* it shouldn't touch - but is not the same as RvS 1.60patch uses.
Easy come, easy go, but hey as long as it works lol.