Having updated to version 1.2.4, I find that some items in my menu are no longer active at full screen but, if I reduce the screen width, they become active! Also, opening a menu item causes both the submenu and all sub-sub menus under that item to appear, without moving down to the submenu item.
The mobile menu works exactly as it should — all items are active and only the submenu appears when selected.
(See http://www.kcsanews.com and, at 1280 screen width, People, Calendar & Services are dead. Other items are active. Sub-sub menus appear under Groups & Opinion.)
It seems my response submitted earlier got lost! Yes, the issue of inactive menu items was cured by removing the Custom CSS, but the problem remains that opening a menu item causes both the submenu and all sub-sub menus under that item to appear, without moving down to the submenu item.
In the meantime I have reverted to GP 1.1.3 because I had spacing issues (my post “Element Spacing”) but hope to go back to v1.2.4 soon.