I have a top domain and 4 subdomains running off the same code in my Multisite setup. I'm running 6.19 Drupal core that I upgraded last weekend.
In two of these subdomains, when I go into Administer/Blocks, I get a white screen and this message:
Fatal error: Cannot redeclare block_admin_display() (previously declared in /--mysite--/modules/comment/block/block.admin.inc:12) in /--mysite--/modules/block/block.admin.inc on line 23
It is strange because the top domain and the 2 other subdomains go into Blocks OK. If it's not a Multisite problem, is a Drupal code problem?
Any suggestions?