When using a theme that is not Garland, for any menu items present in the navigation menu there are two images associated with the <li> tag: one is the plus/minus image put by activemenu.module, and the other is the image used by the theme.
I see the issue with Drupal 6.3. I am not sure it that happens with earlier versions.
Comments
Comment #1
avpadernoThis problem is related to #292032: Wrong CSS file being used.
Comment #2
avpadernoI am closing this issue, which is for a not supported Drupal version.