Edit > Preferences > General
Uncheck the first choice, Show home screen when no documents are open.
Thank you Bob for your help but I'm afraid I have that unchecked. I have also tried checking and unchecking the other one--Use legacy new document..
The old delete preferences fixed it.
Ian, I'm assuming you've solved your problem by now. If not, this is where you'll find the fix to your problem.
Under "Window" column in InDesign you need to DESELECT "Application Frame" (at bottom of list, just above any current file you may have open). Hopefully, this helps someone else that's going nuts over this stupid frame.