I am using Lightroom 5 on a Windows PC, and I have been using it without incident for 18 months. I use it largely to catalog photos and videos, organize them, and eventually preview them, before editing in Photoshop.
All of a sudden, whenever I select a video and bring it into loupe mode, it displays in monochrome green. I have no idea how I did this, but all videos now show this way. Photos show just fine in color in loupe mode. How do I get my videos back to show in color?