When I do that, the entire bar is covered in blocks obscuring the volume histogram. I can't do a picture because I don't have Rev. 4. But it's either/or. Either the blocks are missing or they obscure everything.
I am still using 8.5.3 so I am not sure what you have going on there.
Heads up to anyone interested...I may be able to get a few more people into a 8:00 pm CST chatroom class (vCap Futures Hotcomm Room) with Trevor from MD tomorrow. The class will be on MD fundamentals and set-ups (only) with myself and one other trader I know adding to the mix.