Check the following local policy of the PC, is set to Not Configured.
Computer Configuration Administrative Templates Windows Components Remote Desktop Services Remote Desktop Session Hosts Device and Resource Redirection Do not allow clipboard redirection.
1. Start Run > MMC
2. File Add/Remote Snap-in
3. Select “Group Policy Object Editor”
4. Click Add, Finish and OK.
5. Navigate to the above path, double click to change to “Not Configured”. Your Done! :-)