The sliders in LR6 CC will not work with a picture. I'm using RAW files. I have LR installed on another computer, and it works fine. I have uninstalled and reinstalled the program and rebooted the computer. Please help! I had a previous version of LR and sliders worked then
Go to the Library module and see if the image is marked as "missing" via the icons.
If yes, you will need to "find missing photo" before you can edit it.