Image explorer not showing objects and textures

Hello once again,

I’ve already meet this trouble a long time ago with Blender while I was just playing with its UI, and now that I’m back to it to really use, I still have this one.

The image explorer displays images located on the hard disk fine, but fails to display any texture or objects.

I’m talking about the explorer one get when hitting the Ctrl-F1 hot key.

Looking about informations about how to set it up, I’ve learned I have to check the “ Save Preview Images ” in the “ Auto Save ” configuration sheet. I’ve done it.

The “ Save Preview Images ” option checked :

http://img215.imageshack.us/img215/4458/blendersaveprevieimageo.png

I’ve also learned, for Windows users, a .thumbnails folder should be located in the user profile directory. I’ve check this directory is there (probably GIMP, which I use a few, has created it), but Blender does not seems to create any object or material preview image there.

What is the option of configuration I missed ?

Have a nice day