[semlar]

Is this an occasional bug or is it always like this? You said it fixes itself after a reload.

You could try calling MultiActionBar_HideAllGrids() or, if that doesn't do it, loop through every action button and do something like..

local function ActuallyHideGrid(barName)
    for i=1, NUM_MULTIBAR_BUTTONS do
        local button = _G[barName.."Button"..i]
        button:SetAttribute("showgrid",0)
        if not HasAction(button.action) then
            button:Hide()
        end
    end
end
ActuallyHideGrid("MultiBarBottomLeft")
ActuallyHideGrid("MultiBarBottomRight")
ActuallyHideGrid("MultiBarRight")
ActuallyHideGrid("MultiBarLeft")