I just upgraded to Lightroom 4 and something happened with my flags in certain folders: they are gone!
I had heard that the particular folder specific behavior of flags was going to be corrected in LR 4 so that one could select all flaged (for instance) images while placed on a collection set, and obtain the flagged photos of al the collections inside this collection set. Well, I haven't tried that yet but I lost the flags in collections!!
Europe, Middle East and Africa