We just recently acquired adobe lightroom. I fired it up for the first time and this happened. The "after" image preview inverted /modified the colors. When I zoomed in and grabbed it to move around, all of the colors constantly fluctuated. Changing any settings also caused constant fluctuations.
Any ideas as to why this is happening? It happens no matter what I do.
After an hour trying to figure out what change I accidentally made... and after a few searches on the forum I found this.
You are Welcome, Glad to help.