I've been trading on Coinbase about 4 years. I sent a Litecoin back in April as a test before sending the rest, and it's still pending on the Coinbase end after 4 months. After several support tickets, and trying to call I gave up on them entirely. It shows up with over 60 thousand confirmations, and they just completely ignore me. I'm not the only one that's had this happen in recent months. They have quickly turned into the worst exchange available. I'd heavily advise against trading with them. If you have an account with them, move it somewhere else, or offline.
This is bad, i have been hearing too many of these stories. I hope they are not going to go bust.
That seems doubtful. They are backed by huge VC money that seems willing to bail them out of any potentially dubious legal situation. The biggest problem is probably still a large influx of new customers on a badly-scaled exchange.
It seems like the best way to get your support ticket answered these days is to start a thread on Reddit (Bitcoinmarkets is probably best). I've seen many issues get solved quickly that way. It's pretty pathetic, but if it works, why not?