Since LRCC came out, I've been having a problem with scrolling using my Bamboo tablet. It's a very old tablet but works fine with LR5.7. When I try to scroll, the hand never makes the "close" motion and the scrolling is excruciatingly slow and inaccurate. I tried installing my daughter's Intuos Pro and had the same problem. I noticed that there was a problem with pen pressure in the initial release which is marked as fixed in 2015.1 but the scrolling issue remains for me. A Bamboo tablet has no pressure sensitivity so I don't know if that would impact me.
So, again, I can open LR5.7 and it works fine then go into LRCC/2015.1 and it doesn't scroll.