RoundCube ISPConfig 3 Apache2 webmail adress change

Hi, ive got one question.
I followed tutorial "Using RoundCube Webmail With ISPConfig 3 On Debian Wheezy (Apache2)"

Code:

http://www.howtoforge.com/using-roundcube-webmail-with-ispconfig-3-on-debian-wheezy-apache2

and it works great!

but this example is just for allias "mydomain/roundcube"

when i changed adress to "mail.myidomain" all ISPconf plugins (jqueryui", "ispconfig3_account", "ispconfig3_autoreply", "ispconfig3_pass", "ispconfig3_spam", "ispconfig3_fetchmail", "ispconfig3_filter") stop working

i think it needs just little change in some config file.. can anyone help please?

thanks a lot