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In my opinion, no matter how catastrophic the error is, anyone ought to be allowed to inspect the historical blockchain, that includes browsing old articles and replies on sites like steemit.com, as well as checking the wallet. This is important for user confidence, and also for search engines, etc.

As no new blocks are produced, it will of course be impossible with any actions that are to be recorded in the blockchain, that includes placing orders on the internal market, voting, writing replies or posts, etc. Ideally some alert should be shown even before the reader considers voting on anything, but a generic "an error has occurred" when trying to vote on something should eventually suffice. I believe the latter is roughly how steemit.com works today if an action cannot be recorded in the blockchain for whatever reason; one gets some error message in red text.

agreed, it will possibly all happen when STEEMIT is declared out of beta and big investors allow for / deliver the needed quality resources - hopefully sooner than later!