I just wanted to use Ctrl-c and Ctrl-v on the remote machine. This did not work - and - beeing in hurry - I could not find a way to make it work - so I asked the person on the remote machine to do this for me.
But how can I enable these essential shortcuts for remote use in RU?
Could you please try updating Remote Utilities to the latest 6.12 Beta 1 version and see if the issue persists after the update. The issue with certain keys not working was fixed in this update. 6.12 Beta 1 version is available for the download here.
Before we proceed to further troubleshooting I recommend that you install the latest beta as an issue with similar behavior was already fixed in the previous beta version. If the problem persists even with the latest beta, we'll see further what it might be.
However, you might also try using a vanilla Agent and Portable Viewer to check if the issue still persists or not before updating your current installations.
Version 6.12 Beta 2 of Remote Utilities is available for the download on this page. Please, make sure that you upgrade both parts - i.e. Viewer and Host - to avoid version mismatch that might also lead to performance issues and some features not working.
Please let us know if the issue persists after updating to the 6.12 Beta 2 version.