Hello Brian,
This is an issue with IE11. As a workaround, you can set your browser to use Compatibility View: click on Tools, Compatibility View settings and then the Add button to add your site to the list.
We have an editor upgrade in the works that will fix this issue so please use the workaround in the meantime.
Thanks,
Jason.
Jason Attfield on 2015-03-18 11:44:55.046