Thanks, Mike. I'll have to check that. They're using the Newswire theme and does use Skinr. Also, the site is still on 6.22.

Nancy

Injustice anywhere is a threat to justice everywhere. -- Dr. Martin L. King, Jr.

From: Michael Prasuhn
Do you have an old version of the Skinr module installed? Older version
are particularly prone to causing this problem.

In short this problem is caused by a race condition when two separate
requests are trying to rebuild the theme information in the database
from all the individual .info files.

This was fixed by introducing a lock there to prevent concurrent
rebuilds of the theme data, and you'll need Drupal 6.24 or newer to
prevent these errors.

Here's the relevant change if you are interested:
http://drupalcode.org/project/drupal.git/commit/bf4c9bf97f67c64450680e152258e62178c34285