TinyMCE Stopped Allowing Links

[KitchM]

All of a sudden the editor has the add link button greyed out. I used it before and now it doesn't work. Same browser and same everything.

Firefox 26.0, Fedora 20, Xfce 4.10.1. Server CentOS 6.5, CMSMS 1.11.9, TinyMCE 2.9.12.

Anyone have this problem before?

[velden]

First select some text. Then it should be enabled.