Incorrect validation key

[Rizzit]

I bought M&B Warband and played til yesterday, now it says incorrect validation key, wtf steam? Why can't you guys be professional for just 1 time in your life. I dont care that your release date is: XX. Fact is all the other platforms are allready giving the right versions and Steam is like everytime the last in the line. It's the last time i ever bought a game over Steam damnit!

[Trixtran]

dont know why, but sometime i get this error too..
Try to check ur game cache... every time i do than it works again :P
sorry for my bad english XD

[taleworlds]

Actually that is a bug with the program and not Steam's fault in any way. There are several other players that have experienced this as well. We are trying to understand the cause and we'll try to sort it out as soon as possible. Very osrry for this inconvenience.