So the bug I mentioned with drag and drop has been confirmed by Altium and they are working on a fix. It only affects the Fall Creators Update. M$ have introduced mouse gestures or something, even tho there are currently no settings for it. If you have videos scaling set to anything other than 100% it won't affect you either apparently.
Drag and Droping tabs actually still works, but you have to 'throw' the tab rather than simply dragging and dropping gracefully. If the mouse isn't moving why you let go of the button, it doesn't work.