There is a very annoying problem on some Windows 10 systems, please see the screenshot: https://s27.postimg.org/r3j7svptv/Acti_Pro_submenu_gap.png
As you can see, there is a gap between root level menu items and sub-menu. If you move mouse to sub-menu not fast enough, you will get submenu closed.
We tried six Windows 10 machines and this problem constantly reproduces on three of them.
Any workaround we can use in frames of version 2015.1 in order to fix it?