Since installing LR 2015 2.1 when I import from a card the RAW files are OK but my jpegs are blacked out. The images are there because if I convert to b&W and then back to color there appear momentarily before become blacked out again? Any ideas to help?
For existing photos, select all your images in Grid view, and then click the Reset All button in the Quick Develop panel. Then click the Auto Tone button to properly apply this feature.
To prevent this from occuring in the future, choose Lightroom > Preferences > Presets (Mac OS) or Edit > Preferences > Presets (Windows). Uncheck Apply auto tone adjustments.
Hope it helps.