In conjunction with CKEditor 3.4.1.5892 no links appear when you click on 'insert link'. A javascript error sign appears, but disappear on some kind of reload.
Also the close button on the right is not visible.
It all works fine with IE8. Hopefully IE will disappear in obsoleteness in the near future, but till then I hope this can be fixed.
Closed: won't fix
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It's likely this issue predates Contrib.social: some issue and comment data are missing.