Hi Mike,
It works, and always has, for me. I might get the occasional glitch when I select "too many" folders/files. The number of folders/files, when it happens to complain, isn't a consistent number though.
I get it, the folders have to be in the middle pane.
I was opening expanding the main folder in the left pane and then trying to select multiple folders underneath it.without displaying the folders in the central pane.