Lately InDesign CC 2015 (Windows) has become unresponsive–for example, I can’t close the application, even though everything appears to be working smoothly. Windows Task Manager tells me the program is running normally, but the window won’t respond to the cursor. I can’t close it, minimize it, or work with it. I can work with other programs while it remains unresponsive (as now, while I am posting this), but the only thing that will close InDesign is shutting down the computer entirely. Anyone else have this problem? Any solutions?