[Note from John R Ellis: This was reported fixed in 2015.8, but there have been numerous reports of the symptoms coming back since then: See later posts in this topic.]
It may sounds confusing, but when I select one collection or a published folder and go back to Folders and pick up one folder, Lightroom does not deselect that collection or published folder and I can not go back to that collection until I select another collection.A folder in Folders section is deselected when a collection or published folder is selected.I'm using LR CC 2015.1.1