I am having this issue and have tried everything in this post - the RDC already had Clipboard checked. I have rebooted the server, the laptop that I am using RDP on. Still unable to copy and p paste from the Event Viewer. I can't even copy and paste to Notepad on the same server with NO RDP.
This is ridiculous - with a Mac you can copy and past from any dialog box that pops up. Why on earth desert Microsoft allow this on all their products and OS? Makes life so much easier and saves a ton of time for the administrator.
Microsoft needs to think about how their customer use the event viewer log.