Thanks for the reply. Just writing to say that the problem is still
present. Now I use Ma Gnus v0.8, but the gnus init file related to
news.gmane.org has remained same:

(nntp "news.gmane.org"
        (nntp-address "news.gmane.org")
        (nntp-server-port 563)
        (nntp-stream ssl)
                      
mihkel

Ted Zlatanov <tzz@lifelogs.com> writes:

> On Thu, 14 Feb 2013 13:24:36 +0200 mihkel <turakas@gmail.com> wrote: 
>
> m> This has been going on for a while now, but now the limit has reached :)
> m> I am subscribed to several newsgroups via gmane.org and whenever I hit c
> m> (mark all articles read) in Group Topic buffer Gnus asks me a
> m> username. I usually hit C-g to avoid providing one. All articles are
> m> marked as read then.
>
> m> I can read messages in gmane newsgroup without providing a
> m> username.
>
> m> What is going on?
>
> I have no idea, sorry.  I've never seen this happen.
>
> Ted