I believe this has been touched on before, but am wondering if there is a mechanism for alerting users to an answer which has been edited? Using the only polite example, I might post an answer people kindly up vote. I may then edit it to add something monumentally silly - but the up votes will remain the same, I suspect. Is this an S:E issue?
I haven't tried it myself, but according to the answer to this Meta.SE question, if you favorite a question (click the little star next to it), you should receive notifications on your profile page when it or any of its answers is updated.
It looks like its not the typical "inbox" notification, so that solution requires you to know to reload your profile page to check for updates, but its something.