If you're referring to NovaTraderEx then I've done some research, I couldn't find much about scam accusations but it seems like the creator has been inactive from the forums since April and they also haven't posted anything in their twitter account since late June.

Why are you using this exchange in the first place? I can only see one coin that is not listed somewhere else and that's RPZ which have a pre-mine of 10 million coin, I would stay away from it If I were you and as for VitalCoin, It's tradable on C-CEX apparently.