Preview doesn't appear

[Brepo]

Whenever I slice anything the slicing goes fine and the gcode is fully usable, but the preview is completely blank. I've tried reinstalling simplify and rebooting my PC multiple times. I'm running Windows 10 64-bit. What can I do to make the preview visible again?

Here's a part before being sliced:

And here's the preview for that part:

[JoeJ]

I would suggest trying to update your graphics drivers. If you have a really old driver, it may be causing the issues. Go to the manufacturer's website manually and check since the auto-update option with the drivers is very commonly wrong. Installing an updated driver for Win 10 will likely fix it.

[jimc]

you have the start and end sliders in the same spot

[CompoundCarl]

Uncheck the "single line only" option and then move the start slider to the left.