I've noticed that finder in Lion acts very much like finder in Leopard until they fixed it with Snow Leopard. I think it was an update to to Cocoa which fixed everything, but since the upgrade, I'm getting conflicts with 'arrange by' and 'sort by', which forces me to constantly re-arrange the files while more often the thumbnails for the files and videos won't show up. Until much later. There's also some odd behavior in the grid alignment. When I open a finder window, the files are distributed farther apart until I re-arrange them manually with the same distance set up.