On Natty, I could drag a file to an icon on the launcher to bring up the window (e.g.: drag an image to the Firefox icon and wait for its window to show and then drop the file on, say, mediafire or Gmail window to upload). Now it just doesn't work anymore.
I've filed a bug about it but nobody answered. I'm wondering if this is the new default behaviour? If not, please try to reproduce the bug in your systems (I've confirmed it in two computers) and mark the bug as affecting you, please.