...
(Log out)
(Log in, selecting Fluxbox from drop-down selection (icon with 3 bars) )
(Right-click desktop, select "Run command")
(Type in "fluxbox-generate_menu")
(Right-click desktop -> Fluxbox Menu -> Configure -> Focus model)
(Cick the following options and ensure they are not selected to disable them:)
(Focus New Windows)
(Auto RaiRaise)