In the readme for F,S,. Water Configurator it says when in game ( aircraft on runway , I presume ? )
press Alt + tab to switch out of and back into Flight Simulator.
When I do this the screen just goes black, ? (F.S. Steam edition )
They could give you an instant answer.
Thanks for the info, it appears instead of alt+Tab a screen refresh of size or F.S. restart is required.
Glad you were able to work it out.