UB 'it's your turn prompt'

[Rainbow Warrior]

I multi-table usually at 3 different sites. My UB tables give me no audio warning that it's my turn when I'm clicked on a different site. If I'm on another UB table it works, but not if I'm outside UB.
The taskbar flashes but I want sound. Sound prompts from other sites work fine.
I've re-installed UB twice after fully deleting. I have 'Play Sounds', 'Play Alert Sounds' and 'Force Table to Front' all checked.
Their support suggested what I'd already done.
Any advice or is this usual??