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/bf4c9bf97f67c64450680e152258...