Strange problem with model editor

[eliasfrost]

Tried that with no results.

I tried to create a new model to see if it was something wrong with my last one, but with this model it's the same problem (and this is just a plain). I'm using Blender 2.59, is there maybe a chance that the collada exporter is messed up? Do you know of another collada export plugin for Blender? Thanks.