Funny how my Coinbase account only allowed me to sell for the last 6 days until 5 hours after the plunge on friday then it allowed me to buy finally. Wonder how many other people experienced what I did. I had been trading fine since 10/11/17. Luckily I was fully invested before my account was blocked. I tried to open a Kraken account wed and thurs w/o out any luck. I kept getting a username error when I was trying to set up my account. Good Luck all.