For the last two weeks, Cryptopia has been having issues with many of the wallets they support. Unfortunately, this list also includes Musicoin's. This is resulting in deposit/withdrawal delays or "missing" funds.
Although we have already reached out them, the issue is not yet resolved.
In the meantime, please be patient, and understand that we are aware of this outstanding issue, and share in your frustration.
Bittrex wallets are fully functional at this time.