I think there is a bug in LR 4.3. When I click "auto" in development, The exposure slider doesn't work until I click "auto" a second time. I usually click auto and then make further adjustments and there was no problem with this in LR4.2. The bug seems to occur when 'soft proof' is selected before selecting auto. I also added a "lens correction and remove chromatic aberration" to a user preset that is applied when importing images.
My usual workflow is 1) develop, 2) click soft proof box, 3) click auto. At this point the soft proof is created and the slider button in the develop section will slide but produce no change in the image, 4)click tone, 5)click auto. At this point the sliders will work. System: Windows 7 pro, 64 bit Nvidia m555 graphics card in Dell XPS laptop.
My usual workflow is 1) develop, 2) click soft proof box, 3) click auto. At this point the soft proof is created and the slider button in the develop section will slide but produce no change in the image, 4)click tone, 5)click auto. At this point the sliders will work. System: Windows 7 pro, 64 bit Nvidia m555 graphics card in Dell XPS laptop.