often i play with a friend and before i could see what was going on on my monitor during he was playing on the rift. now the option is greyed out. how do i become this option back?
Clone mode is not possible with the Oculus Rift DK2, hence the option is not available anymore when using a DK2.
You can still try to force it through the OS (set the displays to clone mode in the Windows monitor config and choose “Use system settings” in vorpX, but this also will not work with the DK2. Nothing vorpX can do about this, this is a limitaion of the DK2.