Dialog box not appearing when selecting Define Custom Shape

Hi folks!

I am trying to save a custom shape that I created using the pen tool.  When I right-click and select Define Custom Shape, the dialog box does not appear.  The path is selected in the Paths tab and I'm on a new blank layer.  The odd thing is that I was able to create and save a new shape earlier while in the same PSD during the same session.

Here's my homework:

• Deleted a bunch of custom shapes that I've created over the years.  Restarted PS.  Tried again, didn't work.
• Reset my preferences.  Restarted PS.  Tried again, didn't work.
• Searched for a solution on here, read this article, but none of the solutions worked for me.

I'm on Windows 10 with 16GB RAM, plenty of drive space and using the latest PS 2020.

Any help would be appreciated.

Thanks,

Bob