@jeffdbeats, can you post a screencast of what you are seeing? On a simple test, I did not see the layout grid disappearing when I move a body. So, a few questions:
I have the same issue.
Whenever in model window I select an object and activate "move"-command (by pressing M) the layout grid disappears and becomes unchecked in the "grid and snaps" tool palette on the bottom of the screen. Even if I turn it back on, it disappears as soon as I press anything on the move-tool palette.
I have the same issue.
I think restarting program helped/ removed the bug... I love Fusion360 but every once in a while I get some strange things... the only other bug I can think of off top of my head is some times zoom doesn’t work if I hover off and on sketch it will start to work and in sketch mode sometimes drawing tool will seem to lag / not go where my mouse is unless I ecscape and reclick... other than that it is good.
Jeff