I spotted this at the top of a page:
Warning: preg_match() [function.preg-match]: Unknown modifier 'p' in 
/a/httpd/sites/wiki/export/includes/EditPage.php on line 645

To reproduce, go to your prefs and make sure "Prompt me when entering a 
blank edit summary" is enabled. Then edit a page, and click save without 
entering a summary. It will give the message as expected ("Reminder: You 
have not provided an edit summary. If you click Save again, your edit 
will be saved without one.") but there is that warning message on the 
top of the page.

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