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Don't forget to turn off compatibility mode and restart the cura afterany changes.

HI there ... it seems i have the solution for that. My laptop is using an old nvidia GT 640m , with on old I7 processsor and windows 7 home premium. since the problem is with GL rendering, the solution is quite simple. All you have to do is just add cura program files at nvidia control panel as picture below. and don't forget to choose "high performance NVIDIA processor" . Close , and That's it! run Cura, and preview bar will show up as usual. If you are using AMD driver, use the same technique. It seems the issue comes with laptop with dual graphics card. Some how the windows detects Cura only need default Graphics Card, that doesn't support open GL . I hope my solution helps Rafael