Copying this over from Steam so it can be better seen and dealt with because, while i can't corroborate it since i don't use the Steam version, it's rather important if it is indeed an issue.
http://steamcommunit...84289304007933/
Specifically, the post from Dr. Shadowds.
When to start it up, it traget WPLauncher.exe, and once you sign up, it will then traget launcher.exe, I think the problem is with WPlauncher.exe, not 100% sure on this.
It's rather odd that this is an issue. If it was just one poster, I would have dismissed it as a troll, but it seems to be affecting people to the point that htere's a steam guide to atach the non-Steam version to Steam just to work around the error.