I normally use LR on my Mac, but my work recently purchased LR for windows (they don't support Macs)
I have downloaded the camera RAW to DNG converter, but when I attempt to open the converted files in LR, I can see then in the preview screen, but when I change to the "develop" mode, I only get a blue screen, but I can still see the image in the preview window on the left.
I've never experienced this on my Mac.
I'm hoping someone can help :-/
It sounds like you may be running into an issue with an unsupported/incompatible GPU card. Try the following.
1. In LR Preferences, go to the Performance tab
2. Uncheck "Use Graphics Processor"
3. Go back to LR Develop mode
That's it! Thanks Chris!