I really don't get why there are so much bad reviews on Yobit ... I reviewed this exchange some time ago (source FR) and it was pretty good. Simple to use, good security, and many coins to play with ! I didn't had trouble so i didn't get with tech support. For the old coins support it looks that it's pretty hard to maintain all the infrastructure. Look's like Cryptopia as the same problem as Yobit to maintain a very large amount of coins and tokens ...