Audio volumes setup not working in 4.11?

I had my audio volumes correctly balanced in 4.10. My exterior volume settings were operating as desired - being manipulated by my blueprints as required.

That has all fallen apart in 4.11. Basically, none of the settings seem to be applying correcting and the blueprints are no longer changing the volumes. Is there a new setting in 4.11 I am missing; is something overriding my setup?