Hello
I have a problem with the grid.
I started a scene with the scale in meters and the objects and the grid were alligned nicely but know the grid is way too big.
The objects are still scaled correctly tho.
I tried switching the scale to milimeters/cenitmetes/inches and then back to meters but the scale is still too big and the grid also fades awaywhen zooming out real fast.
This is not a bug, you just have it set up incorrectly. Go to "Display->Grid->(options) and change the extent of the grid, the number of units and the grid-lines display. You can make the grid appear any way you want, regardless of what unit size you select in the preferences.
The grid disappears because of something called the "Clipping Planes", which define the near and far extents that the camera is able to see. This is a customizable option in the camera Attribute Editor.