Sorry, but I didn't read Hans mail until yesterday.

Frederic: Looking at the description and the document I would think that there is another Java - Version (1.5) installed on your computer which is used by SweetHome3D. That's the main difference between my plugin and the others: My plugin is compiled explicitly for 1.6, the others for 1.5.

I defined 1.6 in the plugin description, but unfortunately missing requirements are logged to the (in most cases not visible) console only.

Emmanuel: Either you offer access to the console like I already suggested in one of my CRs, or show problems with plugins in a dialog (e.g. in the GUI for plugins we already talked about).