When I make a change in the Develop Module, the changes are not displayed correctly in the main window, and the navigator window turns grey. When I return to the Library Module, the changed image is correctly displayed. Then when I return to the Develop Module, the changes are correctly displayed. I followed the troubleshooting steps and at one point Adobe says the user permissions might not be right. I created a new user, and in the new user profile, LR works as it should. I am using Windows 7. What do I need to change in the old user's 'permissions' to match the new user's 'permissions'? I would prefer to delete the new user, rather than re-create my computing environment all over again.
If you see grey windows in Develop it is almost typically a bad monitor profile in Windows. Unfortunately quite common. You should recalibrate the monitor. If you don't own a calibrator, try going into your monitor's properties pane. Go to the Color management tab and delete any profile associated with the monitor.
Thanks for your quick reply Jao vdL. I recalibrated my monitor and that corrected my problem.