Before upgrading to 2.5.1, I was using the Search Everything plugin to search pages as well as posts. [With WP < 2.0.6 I had been using Pages Advanced to get this functionality.]
On newly installed 2.5.1 sites, the default search now works fine to show both posts and pages. But on sites where I upgraded to 2.5.1 but did not activate the SE plugin after the upgrade, the search is returning only posts.
Does anyone have pointers on where to look to fix this?