Try turning off GPU acceleration in your Lightroom preferences.
Thanks heaps for the prompt reply !
I tried your suggestion however the problem is persisting.
Really bizarre. Any change made via the sliders is reflected in the Navigator preview pane.
The instant a tool is applied to photo, the whole phote greys out.
AFTER APPLING A CROP
Got me stumped. I'm thinking of a delete / install for LR. Shouldn't have to though
I found this happened after stacking a large bunch of photos. I went back to the library and found a tiny spinning wheel icon in the metadata panel, as though LR was stuck in a cycle.So I quit LR and re-launched and that seemed to solve the problem
Thanks 99jon ... but I am still having no luck .. still the 'grey out' issue.
From the discussions going on there seems to be a fair number of issues with LR 6.1
I am not sure what to do next. I may have to go back to LR 6 or even 5 although I am not sure how problematic that may be.
I'll keep searching.