Truly bizarre bug

[Saito Hajime]

Someone explain to me why my client file is constantly being called bad by the launcher and downloading before i can play. I've patched all that i need to, and after it downloads the fix it plays fine, i even got the launcher update. But, when I leave the game, I cant launch it again without doing a file check and redownloading the client fix. It refuses to stay fixed. Worse, this last time the "file check" option doesnt appear on the launcher so it looks Like I may have to reinstall, of course, I've already done this and it didnt stop it from having to download the client file over and over.
any body got a clue as to what the hell is goin on here?
Thanks
Saito

[Andruil]

That's the first time i hear of that bug. Weird one. Maybe you have a virus that modifys your .exe regularly. Have you checked your system for viruses?