I recently upgraded one of my PCs from Lightroom 5.7 to CC 2015.10 and began using it without problems. After a day or so I began having problems. When I went to change folders by going from Develop to Library and changing the folder everything looked fine but when I then tried to switch to Develop, Lightroom would show a busy status and never come back. I have let it go for 15 to 20 minutes with now help. I have had to close Lightroom and restart it. It will default back to the original folder. The only way I can change folders is to go to Library, close Lightroom, open Lightroom and then switch to Develop.
Any ideas on what's going on.