Indeed.. In vista, there are two different interfaces for toolbars to implement.. One is backwards compatible (same as XP, 2000), the other is vista only. The first one does not support transparency. If you implement only the first one, it works in all operating systems, but vista then disables transparency for the whole taskbar if you use it (since it wouldn’t look very good to have a single non-transparent object on the otherwise transparent taskbar).
If Windows 7 turns out to be worth the effort, I’ll definitely implement the new interface, but with Vista being such a dog anyway, it seems like more trouble than it’s worth. As long as the audio itself works in Vista, I’m happy. 😉
///Leif