Much like the other post by the vista/win7 user only I'll add details to this post of mine. Playing US Version
AppName: pol.exe / AppVersion: 1.18.13.0 / ModName: ffximain.dll
ModVersion: 3.0.0.0 / Offset: 002c1c66
Windows XP Pro SP3 Fully Updated to todays latest Microsoft updates.
Re-installs are fruitless, can't play on a test server if I can't get into the game.
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The normal version of the game works just fine though.