[Tickets #11735] creating new task fails

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Ticket URL: http://bugs.horde.org/ticket/11735
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  Ticket             | 11735
  Created By         | jmozdzen at nde.ag
  Summary            | creating new task fails
  Queue              | Nag
  Version            | 4.0.0
  Type               | Bug
  State              | Unconfirmed
  Priority           | 2. Medium
  Milestone          |
  Patch              |
  Owners             |
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jmozdzen at nde.ag (2012-11-21 13:46) wrote:

When pressing "save" in the nag "create new task" form, I'm receiving  
a 404 page:

acces_log:
192.168.103.81 - - [21/Nov/2012:14:09:11 +0100] "POST  
/horde5/nag/t/save HTTP/1.1" 404 1449  
"http://***myserver***/horde5/nag/task.php?actionID=add_task&tasklist_id=***somelongid***" "Mozilla/5.0 (X11; Linux x86_64; rv:16.0) Gecko/20100101  
Firefox/16.0"

error_log:
[Wed Nov 21 14:09:11 2012] [error] [client 192.168.103.81] File does  
not exist: /srv/www/htdocs/horde5/nag/t, referer:  
http://***myserver***/horde5/nag/task.php?actionID=add_task&tasklist_id=***samelongid***

In bug #11727 the same result seems to happen, but I do have  
Horde_Routes installed:

horde/nag                        4.0.0       4.0.0 A web based task  
list manager
horde/Horde_Routes               2.0.1       2.0.1 Horde Routes URL  
mapping system

I'm working with Kolab integration, my task list is IMAP-based. I'm  
selecting my personal list, not someone else's. Except for the  
corresponding error message in Apache's error_log, no problem nor  
error is reported, i.e. in Horde's log.

How may I go about debugging the cause of this, any pointers, anyone?