Under El Capitan, I cannot print anymore e-mails in Outlook for Mac (Office for Mac 2011). After giving the printing command, the button is vibrating, but the window to select the printer is not popping up.

This is only the case for e-mails. I can print agenda and contacts in that Outlook package. I also can print Word, Excel and Powerpoint documents.

After I upgrading to El Capitan, it was possible to print e-mails, but after some weeks it became impossible.