Hi Geoff,
Are you referring to the origin of a layer or a paths-layer's path nodes? Remember that the machine origin's Z is where the grid is positioned so anything that is not sitting directly on the grid will appear offset if you're viewing at an angle. I do see a regression in v1.81b, however, which is causing the grid plane to not move to the XY plane that paths are lying on when path-editing is enabled. This would be caused by v1.81b fully decoupling the machine origin from generated toolpaths. Is this what you're referring to?
The quick-fix is to click the 2D/3D toggle at the top of the screen to switch to 2D mode so that the grid is always overlaid onto everything below.
Also, when scaling a layer, its handles will not snap to the grid, but instead adjust the size of a layer in grid-subdivision increments.
Thanks! :]
- Charlie