Wrrrr….. There is a really big difference between WP 2.0.2 I’m using on my main page and 2.1 I’m using for experiments.
I’ve tried to insert image into post using option “Upload file..”. But every time I got message: “The uploaded file could not be moved to”. Hmm… And what does it really mean?

So I tried the same trick here. And I got following message:
“Unable to create directory (…) httpdocs/wptraining/wp-content/uploads (…). Is its parent directory writable by the server?”

And I knew answer! My folder wp-content/uploads wasn’t writeable ;). So simple…