problem with redirects

[jason]

Horde/IMP fans..
I just upgraded to
    * Horde: 2.0
    * IMP: 3.0
    * Turba: 1.0

and everything is *almost* working.. When I try to log into
http://servername.mydomainname.com/horde/imp/

I get redirected (wrongly) to
http://servername/horde/imp/redirect.php?Horde=ba6a4a5af65bcbafb1c821c64290
or something like that which of course fails.. so the domain name gets
taken off somewhere.

Ive searched hi and low on google in the horde list but cant seem to find
the answer. Can someone please give me a hint? Its obviously a config
error, but I cant find it.

regards,
Jason

--
Hanlon's Razor:
	Never attribute to malice that which is adequately explained by
stupidity.