Same with our server, we updated the ARMA3 today and reloaded the mission. We get the VAS "Not loaded" error in game but also a error popup when joining which was not present before.
Link to steam screenshot: http://cloud-2.steampowered.com/ugc/612771544492894996/5DD6709636C4D5CE2E5FBD5FEED54657ACF65983/
Regards
Rob