Question Links don't work

After I installed the new beta on a testsite everything looks OK, but what I link I click none of them work.

Try it yourself:
www.natuurtest.nl/site
login : test
pass : kunena

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Hi, what is SEF/SEO component you are using?
How is configured that component?

Have you try to clean cashe (first disabling SEF/SEO)?

I don't have a SEF/SEO component running. Just the one of Joomla itself.

I have already tried to clear the cache but that doesn't help. Tried it again but the same problem persists.

Ok, and how is configured joomla SEO, what option is checked?

And if you disable SEO does form works normally?

All options set to Yes.

When I disable SEO everything works OK.

When I enable SEO and the disable the other options it doesn't work anymore.

Good, now, have you renemed htaccess.txt to .htaccess in joomla root?

If not you cant check second option.

First option is OK.

Third option activate only when you see all works well with first two.