Have you tried disabling GPU acceleration? Let us know if that makes a difference.
Edit >> Preferences >> Performance (tab)
Lightroom >> Preferences >> Performance (tab) on Mac OS
Uncheck the box “Use Graphics Processor”
Then click OK
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Go to the Lightroom preferences, performance tab, uncheck the graphics processor option. That should resolve the issue.
Thank you both for your quick reply, that was it!
is it a little odd that by default it wouldn't show the picture? what's that option for?
GPU accelaration is mainly of benefit to those using 5k retina displays.