"Game is not being run as a known steam product" (SOLUTION HERE)

[Bathe in my magnificence]

Just bought this as part of the Humble Bundle and, after waiting a small aeon for it to download (awful ISP), I'n being greeted by this message.

Everywhere I look, I keep seeing stuff about some mod called "The Great War 1918" and how its caused by that, how I have to uninstall everything CoH related and re-install etc. This is my first installation of CoH and I have no mods whatsoever.

Please help as I was really looking forward to playing this.

[Bathe in my magnificence]

Ok... scrap this! I rebooted my computer and it works fine now. Figured I'd leave this up here, though, just in case anyone else gets this problem.

[Ϯ Ooooosh Ϯ]

lol only need to close steam and reopen it its already a documented fix

[Bathe in my magnificence]

haha. Excellent. Well.... always good to reboot anyway. :D Thing is, I found none of this on Google.

[Ϯ Ooooosh Ϯ]

http://steamcommunity.com/sharedfiles/filedetails/?id=175370459