Since AppStrap 2.4 drop down menus show on hover.
When adding new drop down menus simply add data-toggle="dropdown" data-hover="dropdown"
to the trigger link make them show on hover instead of click.
For submenus you should include data-close-others="false"
so the parent menu is not closed when hovering a submenu.
To revert to using “click” drop down simple remove the usage of data-hover="dropdown"
on drop down trigger links.
See https://github.com/CWSpear/bootstrap-hover-dropdown for more info.