[support] Invalid argument errors referencing block.admin.inc

[Jon Craig]

Anytime I go into Site Building, I get:

* warning: Invalid argument supplied for foreach() in
/www/****/****/drupal/modules/block/block.admin.inc on line 33.
* warning: Invalid argument supplied for foreach() in
/www/****/****/drupal/modules/block/block.admin.inc on line 52.
* warning: call_user_func_array() [function.call-user-func-array]:
First argument is expected to be a valid callback,
'block_admin_display' was given in
/www/****/****/drupal/includes/menu.inc on line 348.

And if I try to load the Block page, it's simply a mostly blank white
page, with:

Block Region Weight Operations

At the top, in bold, and nothing else.

I've looked into block.admin.inc, and I don't see anything odd/weird,
but I'm certainly no expert.

This is preventing me from moving our amateur radio club's new site to
"live" status.  Any ideas?