Q:

Upvote/Downvote disappears when you edit a question and then back out

Possible Duplicate:
Going back after voting shows the page without my vote in Chrome 

When I upvote/downvote, then click edit on the question to either see what the edit was or to edit it myself, only to back out by clicking the back button, my upvote/downvote disappears.  If you refresh/reload the page, the upvote/downvote is back, as it should be.
** Note that I've only tested this in Chrome 10 **

A:

If it was caused by pressing the browsers back button and a refresh fixes it, I don't call that a bug.  If you look hard enough, you can see this behavior in many places.

