Thanks for your very(!) quick reply...
Indeed I was referring to display-problems with ISPconfig. I changed the IP address in the config file and all is OK now!
It seems I did set up the host/domain name of the Linux server as you indicated. I've started adding sites & users, and all looks great.
One slight problem though... I've run the chkconfig --add ispconfig_server, and it's listed in /etc/init.d/rc3.d/S99ispconfig_server, but it just won't start after rebooting the server. Any thoughts on that?
For the rest: ISPconfig is a fine piece of work and support from you guys deserves a big compliment!