Upgraded to MOSS Service pack 2 the other day. Seemed like a no brainer to me as we contemplate preparing for SharePoint 2010.
Upgrade went okay… Afterwards the flyout menus on all pages with our custom branding did not work!
Took a lot of searching to finally find an answer…
turns out the Core.js file has a line that says:
Change the false to true, and flyouts were working again!
Thanks to these guys: