Actually, this happens after Arma crashes. Steam send you the offers window when you quit a game.

I also noticed that the game start fine when I launch it in the steam library and I don't close the library window. However, when I launch the game, I close the steam library window and click on play, the game crashes right away.

We need dxdiag and files from this folder for solve your problem. C:\Users\<Name>\AppData\Local\Arma 3 Alpha\

Can you upload somewhere in winrar package please?
When package will be smaller than 5,000k, so you can attach here. Thank you.

http://feedback.arma3.com/how-to-user.html.html

okay uploaded the files.
Good notice Nanamil, I think you could be right.

we need files from this folder: C:\Users\<Name>\AppData\Local\Arma 3 Alpha\

You uploaded files from documents folder with save game and profile.

Issue closed as obsolete. If you encounter this problem again, please create another ticket. Thank you.