Anyone ever have trouble changing the background color in P5? I know how to use the various tools to change the background, but in this particular project (which has been saved many times) the program no longer allows any of the tools to work to change the background color--it's stuck on grey and when I click other colors from the pallette, nothing happens. Is there some setting to lock the background color that I accidentally activated? How do I get out of this? I really need to change the background color for this project. Thanks in advance for any help.