Not sure if it's related to the shares floater, but lately elements of the site disappear as soon as it pops up. Site loads, all looks fine, then the floater pops in and things look messy. When I mark all elements with ctrl+a they're showing again, that's how I got the 2nd screenshot.
Edit: using Firefox
Edit2: seems to be an issue on my end. Also had it in a conversation which don't have the floater.