block->subject set when using one theme, but not when using identical copy of the theme? I have a theme (based on zen). I made a copy of the theme, replacing all the references to the theme's name in the files. I switched to the new theme and copied all theme settings in drupal (drupal 6). 

As far as I can tell everything looks just the same, except that on some blocks (notably the footer menu) the name ("Footer Menu") appears. From the theme files i see this is because $block->subject suddenly is set. 

What's up with this - if the themes are identical and the configuration is the same, why does one have a block->subject set and not the other?
Looks to be a known issue. I see blocks display emptry string for $block->subject. in this thread someone mentions that they had to modify system.module for this to work. you can check it out in this thread here. Looks like a patch is out there for it.