XOOPS Version: 2.2.3 Final
PHP Version: 4.3.9
MySQL Version: 4.1.10
Web Server Software: Apache
Default Theme: kubrick (by kavaXtreme)

I still consider myself a XOOPS beginner, so here goes:

At my site, running the kubrick theme, no users can register because thehttp://....../modules/profile/register.php do not show any content. Using the default theme, the registration form is there, but when using the kubrick theme its gone.

I have tried the various debug modes, but it does not give me anything to work on.

Also the usual message when logging in (...click here if the page is not reloaded...) does not show using the kubrick theme. Same goes for the XHLD headlines module.

Could anyone please help me with this?

Does the default theme work ok?

Yes, using the default theme everything seems OK.