>>I just tried to connect to the UT with Opera, and got four "you are not
>>logged in" frames, as if it had successfully logged on, but then lost the
>>reference.
>
>I don't know about it. This is a browser I do not use. But, it seems, the
>cookie is not broadcasted after the first transaction. Usually caused by a
>proxy which is hidding those references.

It shouldn't be a proxy issue -- I don't have trouble on the same machine with IE.