Important Moderator cannot delete posts before release

In our forum schuldenhilfswerk.at/forum all entries will be checked by a moderator.
When the moderator clicks on the waiting posts in category view, there is this list of post, which he can check or uncheck an then delete or release.
Release works fine, but it is not possible to delete posts!
He checks the checkbox next to a posting, clicks "delete", the page reloads and nothing happens.
we use 1.5.13 but we can not upgrade at the moment, because we use some customized components for joomla 1.5

Thanks in advance,
Hannes

Hello,

What Joomla! version do you using ? Do you using sef component or sef sytem provided by Joomla! ?

Joomla Version is 1.5.11

I enabled sef, mod_rewrite and suffix

I am having the same problem. I can't delete (or approve) posts pending moderation. It was working fine until yesterday.
using Kunena 1.5.13
Joomla 1.5.14 (legacy 1.0)

Any ideas?

tonyh01: The recommendation for the minimum version of Joomla to be used with K 1.5.13 is J! 1.5.14. Even though that is the version you are using, I would personally not recommend anyone using such an old version of Joomla today. Please upgrade Joomla to 1.5.22.

We strongly recommend users to not use legacy mode. If you use "legacy mode" you do so at your own risk. K 1.5.13 (like K 1.6.x) was not tested with legacy mode. See Joomla legacy mode and Kunena

Support with K 1.5 issues, such as the one you have mentioned, is very limited at this time. We recommend that users seriously consider K 1.6 for their future forum needs, particularly as the kinds of issues that you have described in this topic are more likely to receive quicker attention. We are all aware the K 1.5 has a number of problems that will never be completely fixed, except by a total rewrite. K 1.6 is, for practical purposes, that total rewrite.

maxus: see what I wrote above regarding the minimum Joomla version requirements. The minimum Joomla version requirement is described in Technical Requirements .

It is unfortunate that a Joomla "version checker" was not built into the K 1.5 installer, like it was done in the K 1.6 installer, but that's just the way it goes sometimes.