One more wrinkle: I also have an old installation of Adobe Acrobat 9 Pro, worked for years right up until I updated to IE11 and I did some Windows Update..too many changes at once to isolate. Here is my wrinkle: At computer bootup I now get an Acrodist.exe error dialog box:
I hit "OK" and it closes. Now, interestingly, I can subsequently launch Acrodist.exe and it WILL launch without error! However, when I try to "Print to PDF" from within any application, I get a similar but different error dialog box as follows:
The memory location is different. The symptoms I experience are similar to everyone else's after I hit "OK" here: The printing dialogue launches and the blue progress bar appears but then hangs.