Can't use downloads iView in collaboration room

Hi!

I'm trying to add a file to 'Downloads' iView.

Whan I choose the file to add and press upload, 'File' input field becomes blank and I see text 'Please choose file' at the top of the window.

What could be done to make it work?

(EP 6.0, SP 13 WebAS 6.40, KM and Coll are also SP13)

Thanks in advance!

DK