Problem with login jitsi/prosody

Hi all,

I have a strange problem.
I’ve setup jitsi and prosody as described here:
everything was working fine.

Then I changed the domain name.
I’ve edited every config and changed the domain to the new domain.
Now jitsi has a strange behaviour:
When I start a new meeting, I’m asked if I’m the organizer, after this I put in my credentials.
The login windows disappears for a short moment and comes back with the question about the organizer.
If I reload the page I’m authenticated in the meeting.

If I don’t login the reload does not let me in.

Looks like something is not transported from prosody back to jitsi after the successful login.

Any suggestions?
Any logfiles that I can look in to?
Any Debug mode that I can use?