So here is the more complete explanation.  The wallet was put in Maintenance mode due to the mandatory upgrades needed to implement Sanctuaries (i.e., Masternodes).  With the wallet in maintenance mode, no coins of that type can enter or leave the exchange, however they can still be traded internally to the site.  The owner of the site decided to take a vacation and I'm sure neither party, the site owner nor our Dev, knew it would impact things like this until it was set fully in motion.  So, with the site owner on vacation until January, once the wallet is "good to go", he won't be there to update it to the correct version to take it out of maintenance.  So for the near future, no deposits nor withdrawals at C-Cex of BBP.   You could in theory trade your BBP for BTC and then transfer the BTC out (although the BTC fees are pretty steep, so you'd likely want a 3rd step which would be to trade BTC-3rd Coin, and withdraw that coin).