We @coinexchange are currently trying get our wallet in sync with the chain and are actively working with the Dev to get this to happen.

We have had to upgrade the code base a twice in the past three weeks to support a soft fork they are planning. Unfortunately after each upgrade our wallet has either been extremely slow to sync or hasn't synced at all which is the case now and why its in maintenance mode.

Hopefully we can get this resolved ASAP and have it active again on the exchange.