I've been using Lightroom 6 for months and this problem just started today.
When I import photos of trains, the headlights appear normal.
As soon as I go to the develop module, the headlights have bright red patches in them.
The is nothing wrong with the photos. I've tried un-installing Lightroom 6 and re-installing it
but the problem persists. Any help greatly appreciated.
You have the Show Highlight Clipping icon turned on in the Histogram (Right upward facing triangle in the histogram).
You can click that to turn on/off or the j key to toggle both highlight and shadow clipping on/off.
Don't I feel stupid. Thank you so much.
Never mind! We did it all...