Black bar on screen bottom; blocking view.
I have a black bar appear at the bottom of my screen after opening InDesign.
It doesn't move, regardless of what I do with the working window. It doesn't change when I change or reset workspaces. It blocks anything behind it.
Here's a screenshot.

Any thoughts?
Tech Specs:
Mac Pro (early 2009)
2 x 2.26 GHz Quad-Core
16 GB RAM
Mac OS 10.11.6 (El Capitan)
Running Adobe InDesign CC 13.0.1
