[Closed] OSX Yosemite Drag & Drop issues

I've noticed lately that after a while of being logged in to Yosemite on my Macbook, drag and drop stops working properly in certain apps. I've noticed it in itunes and logic pro x. It recognises the initial click, but dragging does nothing. However, in other apps it works perfectly, and like I said it works fine when I first log in.

Another thing, which may or may not be related is that the services menu in finder when you right-click seems to go away after a while and you have to log out and back in again for it to come back.

Any ideas what's going on?