Well, it appears that they are doing "something very very stupid". The Ctrl key trick didn't do anything. In fact, it actually made it worse. Let me try to be really specific in what I'm seeing to see if it helps at all. Again, this all worked fine until the recent WB release, so something changed in between WB versions to bring out the Yahoo stupidity. I have all executables in the Yahoo music directory completely excluded via WB.
If I have Appearance set to "Windows XP style" Yahoo Music works as expected with or without the Ctrl key. Unfortunately, no skinning on anything. If I turn on a WB skin with Yahoo open and touch the Yahoo music window, it crashes. It doesn't seem to matter whether the skin has alpha blending or not.
If I have Appearance set to a WB skin, the Yahoo splash screen will come up and it will go through the plugin loading process, showing what plugins are loading. Then the main window opens and it crashes.
If I have Appearance set to a WB skin and hold down Ctrl, the Yahoo splash screen will come up and then it will crash *while loading the plugins*. So, it doesn't even get to the main window when Ctrl is held down.
Obviously, this is frustrating and annoying. I'm hoping you guys can come up with a plan, since Yahoo isn't going to come through on this one.