check your arma 2 oa folder on server, look if there is Addons folder , if not u have to copy it from arma 2 (not OA) . THERE MUST BE Addons folder in ARMA 2 OA server/game folder. I`ve had the same problem, no intro , no helis like ah1z , f35, no sound, etc.I'm having a problem hosting domination. I'm trying to use a version that another server has (7th Cav) and it will not work. I copied the file from MPmissionsCache to the Arma 2\MPmissions\ folder and it is detected. However, it will not load correctly. None of the scripting carries over and all players are immune to damage of any kind. Lots of UI and interaction options are missing as well. The main objective doesn't trigger. Is there something I am doing wrong?