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Hello,
Mark, please, please send me the same email. I've W7Pro 64-bit, and I've same symptoms as this thread said: http://crashtastic.userecho.com/topic/123506-i-bought-your-game-but-every-time-i-try-to-start-it-i-see-the-updater-loginsee-white-windowsee-a-second-of-the-loading-screen-then-the-window-closes/
Some days ago game just hung after typing login info at "Loading...", but it runs Ok at the same time (so it's not server problem) on two XP units.
Customer support service by UserEcho
Worked like a charm, thank you!