How to fix VirtualBox bidirectional clipboard without rebooting
This happens to me from time to time. Attempting to cut or copy text from within my VirtualBox guest (Windows XP) fails to work on my host's clipboard. The quick-and-dirty solution is to end the VBoxTray.exe process in the Windows guest's taskmgr (if your guest is *nix, you'll need to find the PID in 'ps' and kill it by PID), and then run VBoxTray again from the Guest Additions directory (for example, C:\Program Files\Oracle\VirtualBox Guest Additions) Came across this tip from the following VirtualBox bug ticket #6150 trail: https://www.virtualbox.org/ticket/6150