Coinbase was hosed at the time, I tried to exchange some ETH for BTC on the 20th on another exchange, but the transaction timed out twice. I suppose the next step is to figure out which exchanges were able to make trades while everyone else was hammered.

I also tried to buy some STEEM with ETH a few days ago, I have no idea what happened to that transaction. It could have also timed out I guess.

Update, the ETH to BTC transaction from the evening of the 20th, did go through about mid-day on the 22nd.