Im using newest BL 3.4.6
Newest multihotbar mod with its coremod
Forge 2836 tested with newest same result
Someone posted here the same issue but I couldnt get anything from that, menu invisible only mouse hovering while you can walk and switch items on itembar.
Tested by removing mods and removing multihotbar worked.
Nothing else to say just informing, would be great if there would be fix to this cuz I like both mods :)