Operating system: Windows 10
Graphics card: GeForce 1080
Short description of error
In 2.79b, you could apply the Build modifier to curves and the curve would draw itself onto the screen. This doesn't happen in 2.8. The Build modifier does work with polygons and it also works with Grease Pencil objects. But it no longer works with curves.
The attached scene was created in 2.79b. It works fine there. It does not work in 2.8.
Steps to reproduce:
Create a grease pencil drawing in 2.79b. Convert the GP to a Bezier curve. Select the curve in the outliner. Go to the Modifiers tab and add a Build modifier. Scrub the timeline and you'll see the sketch draw itself on the screen. Save the file. Open it in 2.8. It will no longer draw itself on the screen.