Acrobat freezes when trying to add digital signature

Greetings all,

I have just installed Acrobat via Adobe CC on a newly built desktop PC running Windows 11 Pro.  All software, drivers, and versions are up to date.  I then set up Acrobat to use a self-certified digital signature (I created both the Windows and stand-alone certificates).  

I then try to digitally sign a document via two menu options (both options cause the same result)

• Use a certificate>Digitally sign 
• Use a certificate>Certify (visible signatures)

In either case I am prompted with the option to drag a signature rectangle, but as soon as I drag the rectangle, the entire app window grays out and freezes, and the app can only be terminated via Task Manager.  I also tried certifying without a visible signature, and get the same result minus the prompt to draw a rectangle first.

Please advise how I can fix this.

Thanks!