Perhaps try re-setting user profile (from link on Utilities Tab of Home Window). You'll likely then have to turn grid off again, as its default I think is ON. User profile can sometimes get corrupted and lead to some odd behaviours.
Did you check setting in BOTH locations shown in the picture?
I believe the grid is always on in Alibre Atom3D. I'd have to confirm, but I'm 90% sure.
Hi Michael,
Please check again, as David already noticed, you can deactivate the grid:
View attachment 27724 .