OrCAD Capture 16.3 hangs on load

My OrCAD Capture 16.3 just quit working. When I load the program, I first see the version and copyright splash screen in the center of my primary monitor. Less than one second later, The main window begins to appear on my secondary monitor. With no delay, and perhaps before the main window appears, one of my dual core processor cores goes to 100% CPU usage (overall 50% CPU usage) and stays there. Meanwhile, the main window, which was only title bar and frame with old graphics still in the middle, repaints with all white and stays all white. A small "Footprint Viewer" window also appears with all white body.

During all of this, if I move the task manager around on the two white windows, they do repaint. At least, their frames do. One couldn't tell if the white repaints. However, the splash screen on the other monitor is still up, and it does NOT repaint as I move the task manager across the face of it.

*Immediately* prior to this problem, I was running OrCAD Capture CIS, which I had run many times since it was installed over a month ago. I tried to generate a netlist, and got an error about invalid characters in the path. I closed the current project, and tried to rename the folder tree containing the project. Windows Explorer couldn't rename because some file in the tree was locked by some program. I believe OrCAD PCB Editor was also running. I closed both OrCAD programs and tried to rename again. I still couldn't rename. I decided to leave the folder names as they were, and created a new folder with a short name and no special chars. Then, I loaded OrCAD Capture again and had this problem.

OrCAD Capture should NOT be automatically opening my project or anything, and I did NOT in the end rename anything. Therefore, my actions shouldn't have led to a condition causing this hang. The closest connection at all is the MRU (most recently used list). But since I didn't actually rename anything, that shouldn't be a cause, either.

I have no clue why the program suddenly started doing this.

Note that when I cancel it by either clicking on the red X in the top right corner, or cancelling it with the task manager, it does take a few seconds but otherwise cancels willingly. It's not like some other programs when they hang, where you get the question about the task not ending and cancelling it now.

Also, two line items appear in the Applications tab of the task manager, both for OrCAD Capture with status "Not Responding".

Any and all reasonable advice on this is greatly appreciated. Note that I have tried rebooting and loading with no other programs working. I have not yet tried to reinstall.