In Windows 8.1 Update 1, Microsoft introduced a behavior where if you happen to have multiple displays and move the mouse pointer over to the other monitor while dragging a window for example, it blocks them at the corners. You have to move it fast in order for the mouse to not stick. This stickiness of the mouse pointer was a Windows 8 feature which could be disabled by a Registry tweak. Unfortunately it doesn't work in Windows 10. However I found a workaround for this.