We have several sites on a multisite structure, and almost all of them use Google CSE. However, some of these websites display the error "Refused to display 'http://www.google.com/cse?cx=...' in a frame because it set 'X-Frame-Options' to 'SAMEORIGIN'. This behaviour happens only for a couple of sites. I have compared Google CSE settings, and they are identical. How can I fix this issue?
UPDATE: I've compared directory sizes from both sites and they were different, so I've tried removing the module from the site that doesn't work, and copying one from a site that does work; but no dice :S