Pfffff ... That one hour I'm trying to understand why the export multiplatform no longer works with my Eclipse 3.4 ... so that the delta pack is installed and that everything is configured!
Guilty: A new little box checked in the preferences ("Plug-in Development> Target Platform> Build target platform based on the target's installed plug-ins") which is checked by default and must uncheck it to export to multiple platforms.
There's quite a debate here if you're interested!
