I keep getting the message that my scratch disks are full. However, when I go to Edit > Purge, the only option I have is Video Cache, the rest are grayed out. The forums tell me that means that everything is already deleted. I clicked Purge Video Cache, but I still receive the message that my scratch disks are full and I can't find a solution to this here on the forums.
I use a Macbook Pro, if that helps, and I just updated Photoshop to the most recent update.