WowAce

I'm not sure if it's a configuration issue or a bug, but when I use no layout I get a small black icon in the bottom left corner, which I used as the anchor for both layout and group.

Once I'm displaying the layout the black icon vanishes.

Edit: It seems to be the background color under General -> Display, but if that's the case shouldn't that option be under Position & Anchor, if you color the anchor point with that option?

The anchor point is not colored, what is displayed is the main grid2 window background and border. Grid2 is displaying the main window with no unit frames inside.

There is another option to hide the main Grid2 window in General -> Display -> Show Frame with the options (Always, in party, in raid), this option hides the whole window (including background and border).

The None layout is a standard layout, grid2 does not know if this layout is going to display units or not (because unit frames display is managed by blizzard code not grid2 code), that is the reason because the background and border are not hidden when the layout is set to None.

You can simply hide the main window background and border: set the background and border color to full transparent (in General options).

Technically this is not a bug, i could code a special case for the None layout and hide the main window, but i'm not sure if it's worth it.