Unable to change expansions in Arma 2:OA menu

[idu29660 0]

This does not pertain to A2;OA Beta. I been trying to play on other DayZ mods for the past 2 weeks and I can get into the server lobbies but it hangs up on "requesting authentication." So I thought it had something to do with my OA so I ran OA through Steam and it loaded up Dayz went in to my expansions and it wont let me turn off the DayZ files. So I tried uninstalling and reinstalling, loaded it up before I installed any DayZ files and it still loaded DayZ? I've tried changing the start up command and that doesn't work. Is there anything else I can do that might work? 

[applejaxc 2500]

Did you remove -mod=@DayZ? The expansions list has never worked for me, except for enabling/disabling PMC-and that stopped working months ago.

[Steak and Potatoes 13480]

Check and clear you launch parameters if using Dayz Commander under settings.  Also clear in steam under the properties launch options make sure what appy listed above is not in the bar.