The Terminal Services Team Blog has a great article on why application based clipboard activity can give you headaches in terminal server. Check out their article, Why does my shared clipboard not work? (Part 1).
Why does my shared clipboard not work? (Part 1)
The TS shared clipboard allows you to copy and paste data between local and remote sessions. When it works its really simple and seamless, but what about when it doesn’t? Diagnosing clipboard problems can be hard and frustrating!
It has certainly been causing us major problems lately. We smacked RDPCLIP.exe around and were able to get it behaving again. Once again, a MS Team blog to my rescue. If it weren't for those blogs I would be a very unhappy MS customer. Thanks to MS for letting them pass along their knowledge and thanks to the teams for sharing it as well.