I upgraded some sites from ATA 3.5.1 to 3.5.2. If I don't use the 3.0 menus, I'm fine. If I do create one to take the place of the old page menu bar, no child pages appear on mouse-over.
Apologies if this was already covered, but it doesn't seem to be the same problem as discussed before.
I'm happy to let Flynn or JD or Larry into the dashboard of one of the sites, if they'd like to poke around.