I'd suspect this is a client issue, not a server issue.
We had over 20 players online last night running missions over and over again with no issues.
If this was a situation being seen at the time having only a few players online, then the more players would cause the issue to increase.
I'm sorry, but I don't think it's a server issue.
One thing to try is to have Omega create a account that he can reproduce this on, then PM the account / PW to someone who DOESN'T have the problem, have them log in and try to reproduce. That would pretty quickly determine if it's a account issue, or a client side issue.