Thanks; will try from my laptop as soon as I got home...
Hahaha - from n900 I tried with:
- opera - browser is too old.
- Microb and chromium - cannot load the website.
From under kali:
- midori - browser is too old.
- links2 - does not work as it lacks java support...

That is at least 5 working browsers that cannot achive a task as simple as uploading a file... Now that means something...

But even on my working laptop it says "Cannot load some parts of the website" - tried with Explorer and Chrome (not alowed to use any other...).