When I am done working on my photo in Lightroom I can usually switch to Photoshop and do my final editing. That feature is gone. Last night I got a message after I was in Photoshop that my scratch disk was full, then I got out of PS and remove several gig of data off my hard drive. When I got back into Lightroom then tried to open PS it was greyed out or muted. I tried deleting the com.adobe.photoshop.plist file and that did not change anything. Please help.