Just about every developing tool in my newly acquired LR6 has given trouble. Sometimes a tool fails to activate at all (graduated filter, radial filter, spot removal, brush, even the enlargement tool). At other times the tools work partially. For example, with the spot removal tool, I can never see the part of the picture that is being used to cover the spot, and therefore can't change it. Or with the radial filter, evenif I manage to draw out the filter, I am unable to move it or change its shape after the first mouse click. These problems kicked in a few days after I installed LR6 and now, after every rebooting, they recommence after I have edited two or three photos. This seems to me to be utterly unacceptable in a high-end product from a reputable software company. If I have to go through the incredibly elaborate procedures necessary to reset parameters every time I want to edit a photograph, I'd rather not bother with LR at all. Anyone found a solution to similar problems?