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 2,097k, so you can attach here. Thank you.

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

Hi astaroth .. files attached as requested. You can easily duplicate the error by logging on to our server "Sigclan.com Members Alpha3" server ... if you just put sigclan in the filter you should find it. The pw is membersOnly ... please keep this pw to yourself. I had 'Caps Lock' bound to push to talk ... however the crash also occurs with any of the 'talk' binds and voice over net too.

Also I was running TeamSpeak with ACRE plugin ver 1.1.10 .. and thought it may be this causing the problem... so I ran Arma3 without TS running and still got the same crash.. so it seems TS is not causuing the crash..

I tested it on an other clans server and it still crashes. I also got several people to test it on our Sigclan.com Members Alpha3 server ... they all crahed too.

I tried to upload the .rar file which is 1838Kb but I got a 413 Request Entity Too Large... error, so I cannot give you the files. You can pick the .rar file up from dropbox ... here is the public link.
https://dl.dropboxusercontent.com/u/107456637/Arma%203%20Alpha.rar

Outdated. Open a new ticket if new issues arise.