[imp] MIMP doesn't work Object id

[Martins Purins]

Hello
I have successfully set up  my horde groupware with shibboleth auth.
IMP, turba, passwd modules works fine. But i have problems with MIMP.
When user connect to
https://webmail/horde/mimp/  system redirect to shib and then back and user get
https://webmail/horde/Object id #17
If I replace Object id #17 with mimp I get mimp interface

[05/Jan/2011:12:34:48 +0200] "GET /horde/mimp HTTP/1.1" 302 848
[05/Jan/2011:12:34:53 +0200] "POST /Shibboleth.sso/SAML2/POST HTTP/1.1" 302 301
[05/Jan/2011:12:34:53 +0200] "GET /horde/mimp HTTP/1.1" 301 326
[05/Jan/2011:12:34:53 +0200] "GET /horde/mimp/ HTTP/1.1" 302 -
[05/Jan/2011:12:34:54 +0200] "GET
/horde/login.php?url=%2Fhorde%2Fmimp%2Findex.php&nosidebar=1&horde_logout_token=ejKZ9CHtmMVneEZd5nCNVp5XnSc&app=
HTTP/1.1" 302 26
[05/Jan/2011:12:34:54 +0200] "GET /horde/Object%20id%20 HTTP/1.1" 404 296
[05/Jan/2011:12:34:59 +0200] "GET /horde/mimp HTTP/1.1" 301 326
[05/Jan/2011:12:34:59 +0200] "GET /horde/mimp/ HTTP/1.1" 302 -
[05/Jan/2011:12:34:59 +0200] "GET
/horde/imp/redirect.php?autologin=1&url=%2Fhorde%2Fmimp%2Findex.php
HTTP/1.1" 302 26
[05/Jan/2011:12:35:00 +0200] "GET /horde/mimp/index.php HTTP/1.1" 200 932

Can someone ehplayn this error.
I also found thet this happens with DIMP but not with turba or passwd.
May  be I missed something in may conf ?

Thanks for Helping.