Just realised that it isn't just Mail for me where this isn't working, but the Flash the screen when an alert sounds feature of Universal Access isn't working at all for me in Leopard, in more than one account.
Does anyone know if this is a known issue and if there are any solutions*?
TIA
* Obviously, it isn't an essential feature for me but I did like to have it working in Tiger, especially when I had the volume muted on my computer, so I'd like it back if I can get it.