Since the latest 6.6 Drupal update, Facebook Status module sadly is the culprit of this error on all pages:
preg_match() expects parameter 2 to be string, array given in [mywebsite]/includes/bootstrap.inc on line 732
Disabling Facebook Status module solves the issue...
Comments
Comment #1
icecreamyou commentedSee #331501.
Comment #2
icecreamyou commentedFixed, FYI.