We ask everyone do no transactions and back up their wallet. That goes without saying. We will inform everyone when they can do transactions again.
This does not mean not to update.
Back up your wallet, update and await further instructions.
If you already updated without backing up you should be fine, don't stress but await further instructions still.
No transactions include no trading, right?
Trading would be fine. Do not attempt to withdraw or deposit coins however.
If this makes sense, exchanges are not using coins during trading. They are keeping coins on cold storage and trading within their own database seperate from block chain.
However if you feel uneasy I would also not trade or do anything but update until we can confirm seednodes/nodes.