Jack, Probobly becuse they contain the vista Icons, you can update to the newest version and it should fix it.
Po, All you have to do is make sure you have 3.1 then make your main pack. in package builder create your subpackages. Then create your parent package, in package builder you will see a ?????? button, I dont know why this is, named that way. I will yell at brain abou that.
Anyway. Here you add new sub package. You can add as many as you want.
PS. If you want to just do it in the package file. There will be a, .packages file as text file and enter them that way. the format is.
[Apogee (White)]
File=..\Apogee (White)\Apogee (White).subpackage
LoadMain=1
You will not the subpacks are called .subpackage, this is the same as .iconpackage, except it hides them in the main list.
I am sure we need to get some UI tweeks in to make it a bit esyer to make these. But it is quite simple even now, once you know were to look.