Without having kept track of the exact numbers, while using any of the numerous instances of the jQuery autocomplete in an application I've developed, 1 in every 6-7 attempts signs me out of the application.
I only become aware of this when the autocomplete itself reports that it can't find anything for what's been typed into the search field. Sure enough, when I open a new tab and visit the application, I'm signed out.
I'm using CodeIgniter 2.1.3 and Ion Auth 2 along with jQuery 1.10.1 and jQuery UI 1.10.3, though this bug (if indeed that's what it is) has been persistent over a number of different versions of jQuery.
It's nothing major, but it's happening often enough to be damn annoying.
Anyone else seen this behaviour, and if so, did you fix it?