Reader DC embedded in IE (Win10) cannot launch print dialog. (2004 issue)
For all of the machines in my Win 10 2004 test group, the Reader plugin for IE (AcroPDF64.dll) has lost the ability to start the print dialog, either from the handy button in the border UI, the drop down menu, or Ctrl+P. In all cases nothing happens. There are a variety of versions on the affected machines but most of them are quite current (20.9.20063 and ...65). The problem is restricted to IE (11 I have no other versions to check) and the new windows 10 2004 feature build.
If you're interested in any other data I can provide on the issue feel free to let me know.
Per Bengtsson commented
Adobe has now acknowledged this as a bug and listed it in the known issues section for Adobe Acrobat Reader DC but it seems to affect all versions of Adobe Acrobat Reader.
"Problem: Unable to print using IE for latest Win 2004 update when only Reader is installed. [ADC-4304271]"
It's not clear if the problem is with the reader plug-in (Adobe) or with Internet Explorer 11 (Microsoft) but I'll let Godzilla and King Kong settle that argument.
Meanwhile, it is possible to disable protected mode completely in Reader if one absolutely must use the reader plug-in in IE11 to view PDF:s.
A more secure workaround is to disable the Reader plug-in in Internet Explorer to force the file to be downloaded and opened outside IE. Might not work in all scenarios though.
Alex Warren commented
This is holding up 2004 deployment for our enterprise workstations.