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Lightdm comes up and I can login fine with it as long as I use the last session selected. If I select sessions or power or anything from menu's the top icon highlights, but it never shows the actual menu and you can't select anything from it. This might be related to the recent gtk3 theme changes.
I can confirm that downgrading to gtk3-3.19.4-1.fc24 gets the menus working as before.
Currently only adwaita theme will work with gtk+-3.19/20, or maybe not. See, https://blogs.gnome.org/mclasen/2015/11/20/a-gtk-update/
Yeah, I actually was using adwaita, so even it wasn't happy for this case anyhow. ;)
This bug appears to have been reported against 'rawhide' during the Fedora 24 development cycle. Changing version to '24'. More information and reason for this action is here: https://fedoraproject.org/wiki/Fedora_Program_Management/HouseKeeping/Fedora24#Rawhide_Rebase
Is this a actual problem with latest gtk+ themes? I guess not and it is theme related, can we close this issue?