When I log in router I can't do anything with preferences - all is empty, there is some screens. Who know what is this?
http://www.upload.ee/image/3330780/1.png
Have to ask the obvious.... have you tried a different browser? And in the browser from your screenshot, did you disable all "blocking" scripts? (i.e AdBlock, NoScript, etc) I had the same general type of problem with a managed switch. Turned out that AdBlock was the cause. Disables it, and all menus showed up. Worth a try.
Yes, this was a problem. Big big thank's)
Ah, glad to hear that was the problem! :)