Occasionally when using mixed OS environments and running Remote Desktop Client between the computers, you might have an issue where Cut/Copy/Paste stops working, or only listens to local clipboard content. This seems to happen mostly when connecting to remote Windows XP computers. Here's a quick way to fix the problem (not a permanent fix unfortunately).
1. Create a BAT/CMD file.
2. Open file in Notepad or whatever editor you want to use, and add the following content:
taskkill /im rdpclip.exe
3. Save the file and leave it on your Windows XP desktop.
Next time the issue happens, run that file to fix the issue. It will only fix it during that Remote Desktop session.