There are no technical issues. Wallets are synced and have enough connections. They do this intentional and I have proof for it.
Tested with a small amount of BTX that went through without any problems. Bigger amounts are held hostage. That is not only the case for BTX, same happens for DeepOnion and other coins.
Cryptopia is most likely insolvent and uses the hijacked bigger balances to cover for losses elsewhere and play for time.
I have tested cryptopia on january 17th, took like 1.5 hours for the deposit to appear and 1.5hours for the withdraw to appear in my wallet. What exactly happens there now? Is their wallet unsynced ? Are the deposits delayed as well or just the withdrawals ? I have tried other coins, like btc, doge, ntrn, eth they all worked fine (eth was slow to accept deposits, took maybe 1hour). Is this delay only for BTX withdrawals? Go on their IRC webchat
http://webchat.freenode.net/?channels=cryptopia-ex&nick=typeyournickhere and write them support tickets, try to be short and to the point without cursing or blaming (I do it too and it never helps).