See #1004, this had a good analysis, and this is probably the same problem.

i don't understand why this happened, but since i switched the 
authentication driver i was using from imp to ldap the error has 
stopped occurring.  i believe it is related to the fact that some of 
the accounts failed to login with imap because the maildir for the 
imap user didn't exist on the server (whereas the admin users accounts 
did exist)



most likely is bogus

I can't replicate this at all.

creating a permission for any horde module and adding a "group" to 
that permission causes horde to not work for non-admin users - when 
any non-admin user logs in the get the default screeen (horde) but 
trying to open the url for /imp /kronolith etc results in a page 
timeout or blank screen



can you replicate the bug?



1) login to horde as an admin user

2) create a new group e.g. test

3) add your horde username to that group

4) create a permission for any horde module or horde

5) add the group 'test' to that permission

6) edit the horde/conf.php and remove your admin username from the 
admins array

7) logout/login to horde and try to view any module



do you get a blank screen or page timeout?



if so,



a) re-add yourself to the admins array in horde/conf.php

b) login to horde

c) delete the group 'test' from the permissions for the module

d) repeat step 6-7 above



your module should be visible, so i think it's only groups permissions 
for modules that are affected