[support] right sidebar not displayed

[Seitenweberei.ch]

Hello

I'm new with drupal (5.2):

I copied the garland theme (without minelli folder) to a new folder in 
the theme directory, renamed it and made it the default theme (still 
using garland as admin theme). I assigned two blocks to the right 
sidebar. The right sidebar shows up in garland but not in my new theme. 
The body class in the new theme is "sidebar_left", means the right 
sidebar is empty (according to template.php as I understand).

I didn't make any other changes to the new theme, neither to the 
stylesheets nor to the templates. I checked all configuration options, 
but couldn't find the solution. Blocks are assigned to show for all 
users on all pages. Caching is off. If I use garland as default theme, 
right sidebar is displayed again on all pages, body class being "sidebars".

What am I missing? - Any help appreciated.

Thanks
Richard