Icons overlap on different menu sections

[Ivy]

When clicking on one of the menu sections on the right (Favourites, Internet etc), the new icons appear in the centre.
However, the old icons (or icons from another section) are also drawn, resulting in a very messy display!
The proper icons light up and you can click them, it's just that the old icons aren't being deleted properly.

I'm running Ubuntu 9.04 netbook remix on an Acer Aspire One with the latest kernel from Kuki.me. All drivers are up-to-date. All packages except backports are up-to-date (I find backports not stable enough, as this is my girlfriend's laptop, not a testbed!)

Package: netbook-launcher
Version: 1.6.20-0ubuntu2

There's a screenshot attatched (png format)