Last modified: 2014-04-29 01:04:04 UTC
Steps to reproduce: start with cold cache, click on thumbnail before scripts are fully loaded, press Esc when screen goes black. Loading stops, and user is stuck with a black screen until they reload. This results somehow from the interaction of head.js and bootstrap.js - I cannot reproduce it by clicking when the page has finished loading. Given how hard it is to trigger this bug, might be fine to just leave it.
Might have been fixed by https://gerrit.wikimedia.org/r/#/c/126233/, but unlikely.
Can still reproduce but needs very exact timing.
I think this only happens when clicking on a thumbnail before the page is fully loaded (domready), just that the scrips haven't finished loading does not trigger it.