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Could you describe the precise situation? -- I think if the addressee would be notified anyway (i.e. you are commenting on their post), the @[whoever] is omitted, and if you cannot notify the addressee (they don't have a comment in the same comment thread), this happens as well.
I have yesterday seen this message as well, from Germany -- but the problem was intermittent -- sometimes I saw that message, sometimes the formulas were rendered strangely or not at all or omitted completely. But now everything seems to work well again.
@Scott: Under which circumstances do Stack Exchange employees delete posts on MO without consulting the MO moderators before? -- I'd have thought they do so at most in quite extreme cases(?)
This question appears to be off-topic on MathOverflow Meta because it is not about MathOverflow. It rather should be migrated either to MathOverflow (main site), or to academia.stackexchange.com.
Usually, fixing or removing a broken link is the responsibility of the maintainer(s) of the site containing the link, rather than the responsibility of the maintainer of the site the link refers to.
I think including the exact time in the reference is completely unnecessary -- note that in references to journal articles, usually only the year is given (and not even the month, let alone the precise day or even time).
I think you can just open a browser tab for every question or other page you'd like to revisit in the near future -- hence I don't think there is particular need for such feature (though of course it wouldn't harm either ...).
