For the community, reason and fix is as follow...
The Opera browser is equipped with a nice feature i choce to call "identify as..." wich allows you to either identify as IE, Firefox or Opera. I have had this set to IE for a while since some sites changes their content according to which browser u use, esp. does this apply to some microsoft sites which wont give you the wanted options unless you use IE, something i call ignorant...
However, I have bnever seen any sites, until now, which changes their way of scripting, etcetra as this site does since Opera was not able to list anything of this sites content when identifying as IE. However, when identifying as Opera or firefox there was no problem.
Youst note that your chache may fool you a little bit if you switch from identifying as IE to Opera, loading this page, and then switching back to identify as IE. Next time you are opening your browser you will then actually be able to open at91 still when identifying as IE. But only until chache is flushed, then the problem reoccoures...
Please also follow this thread in AvrFreaks.