So far I've just purchased with them and it's the first time I sell.
It was told to me that Coinbase was the faster service for sale but obviously its not the case.
I just want to know if it's another Mt.Gox and If I'll see my money (as the BC are not in the wallet anymore).
I take it this is your first time selling BTC at Coinbase ?
The wait is normal. I have had to wait longer many times. Never given a reason why (or any answer for that matter) when I put in a support ticket but eventually the money turns up in my account.