The link above will display the output of the module publications_list_block.
If the menu has the full URL everything works fine.
If the menu contains "publications_list_block&pub_count=5" the URL looks like:
This generates a page not found.
The site is using drupal-5.9 with clean URLs enabled. The rewrite rules are present in the .htaccess file
If the menu path is set to "publications_list_block" (without the extra parameter) it also works correctly. The extra parameter controls the number of output lines and defaults to 5.