From Whiztler: We had a great MSO session last night with 6-9 players. Since the latest ACE updates, certain things seem to be broken. Not sure if this is MSO, ACE or other mods that cause this. But here's the report nonetheless :) 1. MEDICAL - Players cannot heal other players. They CAN heal themselves though. 2. Shacktack JOIB GROUP - This seems to be buggy, Only worked for 1 player last night. Hmmmm... since the last ACE update you say? I will check the server again and make sure all mods are up to date perhaps it's something simple. I am ready to test the HC with a 'stock' MSO mission on Takistan... maybe today or tomorrow. If all goes well I can start updating our version to support it. This will be a good time to test those issues you reported with ACE - then we'll know if it is the mission or not. edit: might be latest ACE and STHUD conflicting.. from BIS forums: Myself and 4 others playing on a dedicated server could not interact with each other for medical issues. When we removed the SThud from our presets, the medical interaction worked fine. We love the STHud and would love to know how to get it to work with this. For the record, there was no issue with the SThud and the ace interact before the update for us. We also tried with and without the arma beta. We need a fix for this ASAP. StHud is one of the most critical addons ever released, I just don't want to stop using it now. Even though I disabled it I look at the bottom of my screen every ten seconds only to notice its not there anymore. Very annoying Here is the ticket on Dev Heaven - please vote up if you have an account https://dev-heaven.net/issues/72101 If you can try removing STHUD from your preset, join the server with someone.. shoot them :) ... try to heal