Adobe Reader DC app icon missing

I'm running Adobe Reader DC on Windows 10, and I recently noticed that the standard Reader app icon changed to a "generic" icon. This icon shows up for the app both in the Start Menu and on the Taskbar when the app is running. NOTE: The PDF files themselves are showing the correct icons. It's the application icon that's not correct. Here's what I've tried doing to fix it:

1. Uninstall and reinstalled Reader;
2. Run Windows System File Checker (SFC) -- no errors found;
3. I located the app shortcut (C:\ProgramData/Microsoft/Windows/StartMenu/Programs) with the intent to manually change the shortcut's icon but when I right-clicked and checked the properties of the shortcut, the button for "Change icon" was disabled.); and
4. I tried creating a brand new shortcut to the app's executable (AcroRd32.exe) and put that shortcut in the Start Menu folder with the other Adobe shortcut and rebooted Windows, but Windows never recognized it or displayed it in the Start Menu.

I've attached a couple screenshots to show the icon problem. Has anyone else encountered this? I'd be grateful for any info on how I might fix it. Thanks in advance for your help.