So after finding this post, what @ToanDN stated is in fact true. But what was left out was that it isn't that the Copy Button isn't rotating the view. What is actually happening is that everytime you rotate you view it is making a copy of the view that is rotated, and leaving the original seemingly unaffected. Similar to the OP, I was frustrated that this thing that I knew worked wasn't working all of a sudden. I was similarly happy to find that there was a similar fix, again thank you @ToanDN for sharing it. But the next day I was doing a little Project Browser management and cleanup, and found that I had eight duplicate views of the plan I was trying to rotate. So it is more accurate to state that the view is being rotated, but solely in the copy that it is creating. Which of course is very confusing to the user, as you go through the operation, and get left thinking that the software did absolutely nothing. When in fact it basically hid it from you.
I might suggest to the software developers that in this case they add a pop-up that prompts you and asked: "did you intend to create a copy of this view?"
