Request exceeded the limit of 10 internal redirects

My Apache logs are showing the following error:

Request exceeded the limit of 10 internal redirects due to probable configuration error. Use 'LimitInternalRecursion' to increase the limit if necessary. Use 'LogLevel debug' to get a backtrace.

I suspect this has something to do with my .htaccess in WordPress MU 1.2.3 - this page probably indicates exactly what is happening: http://www.linuxquestions.org/questions/linux-general-1/apache-request-exceeded-the-limit-of-10-internal-redirects-282381/

I'm not sure quite how to fix the .htaccess to prevent this from happening.  Can anyone help?

RewriteEngine On
RewriteBase /
 
#uploaded files
RewriteRule ^(.*/)?files/$ index.php [L]
RewriteRule ^(.*/)?files/(.*) wp-content/blogs.php?file=$2 [L]
 
RewriteCond %{REQUEST_FILENAME} -f [OR]
RewriteCond %{REQUEST_FILENAME} -d
RewriteRule . - [L]
RewriteRule  ^([_0-9a-zA-Z-]+/)?(wp-.*) $2 [L]
RewriteRule  ^([_0-9a-zA-Z-]+/)?(.*\.php)$ $2 [L]
RewriteRule . index.php [L]
 
#redirect home page to latest blog posts
RedirectMatch ^/$ http://www.weber.k12.ut.us/index.php?page=district-blogs

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