I have Lightroom 3.6 loaded on my iMac v10.6 and have been using it continuously for some time. For the second time in just a few weeks the Adjustment Brushes/Sliders have stopped working correctly, that is there is no noticeable adjustment on my image [for example Brightness, Exposure, Clarity etc.]. I cannot remember what I was told to do to correct this problem last time I had to contact Adobe Support about this issue, and I'm told I now have to pay for support for this product now as Lightroom 4 is released.
Is there a way I can fix the problem?
Thank You.