Hi jfeia. Got a link we can see this at? Anyway it sounds like maybe the skin doesn't have the same containers as your previous skin. So like for example if you previous skin had a container called "Sidebar" and the new skin has maybe something like "Sidebar 1" or whatever then the new skin won't show the widgets that were put into "Sidebar".

Go to Blog settings -> pick a blog -> Widgets and see what container names you have there. Once there you can add a widget to any container by using the link off on the right side of the container's name.

Good luck with it!

oh, i see how it works. However, when i click add widgets, it shows "Page Load Error" - couldn't find admin.php ." ....????