For some reason, when I click on either an answer, or any comment under an answer, the answer disappears briefly (on mouse up) (actually it looks like it reloads the answer). This seems relatively new. For example (the yellow circle indicates a mouse click):
It also happens with questions.
As a side note: When an answera post is in this state, it is no longer possible to use the "share" link, as it disappears as soon as you click it to copy the link. It also messes up the "close" dialog on questions.
This is on Chrome 52.0.2743.116, Windows 7.