Last modified: 2014-07-03 22:21:13 UTC
When MediaViewer is closed while a tooltip is still visible, the tooltip gets stuck. Given that the close button itself has a tooltip, this can happen relatively easily. Tested on Firefox 30 and Chrome 35 on Ubuntu 14; only reproducible on Firefox.
Mingle: https://wikimedia.mingle.thoughtworks.com/projects/multimedia/cards/740
Fixed in https://gerrit.wikimedia.org/r/#/c/142633/