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There is a replay attack going on with accounts on Coinbase and Poloniex.
https://steemit.com/poloniex/@isacoin/psa-poloniex-bitcoin-replay-attack

Yup my account balances all went to zero just now

I refreshed a few times and now my balance is correct.. anybody who keeps there main amount of bitcoin on there needs to get a real wallet asap!!!

they are all risky

yeps. get more

Most definitely!

IRS is trying to identify possible tax avoiders, so i think they are involved in this

Even if this had nothing to do with IRS, they will be getting involved either way shortly