Hi,
When I login to your site I see it is not the latest version, it is version 2.3.1.6
http://krangh.homeserver.com/lindometest/Admin/ServerInformation.aspx
either it is a custom build or there are files missing for some features.
I recommend download the mojoportal-2-3-1-7-mssql-deploymentfiles.zip from Codeplex or the 2.3.1.9 preview release mentioned here, and upgrade the site, making sure all the files are uploaded. Backup your Web.config and make sure you use the new Web.config and restore any customizations.
Also after upgrading its a good idea to copy the files from /Data/skins into /Data/Sites/1/skins because I have made most of the skins wider.
Hope it helps,
Joe