It hasn't killed accounts for me; occasionally, flattening hasn't worked. In that case, I flatten in R-Trader.
I'm not saying this is the case in your instance, I'm just guessing here for troubleshooting's sake, if you are on Apex or a firm with similar rules, you can still fail your account and blow up, even if you're only $200 down. That unrealized trailing drawdown gets a lot of people, and you can only see that in R-Trader, not MotiveWave. It's worth checking that's not the reason you got the Admin Only message. As a rule of thumb, if you're doing prop firm challenges, you must have R-Trader open to be safe.
Cheers.