It is a dedicated server and there is only 1 slot for the Game Master so I assume that he is the only person who can use Ares. Yes there are other mods, quite a list do you think it could be one of those? to name a few are ALiVE, AGM, STKR's British Infantry along with a few others. We are also using it on a modded map, in this case 29 Palms and Fallujah. I have not tried it with any other missions so I will get back to you on that.
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I just tried it on a vanilla map with no other mods and it worked fine so I am unsure what is causing the conflict?
Are there any known compatibility issues that you know of?