Dear Maintainer,

When trying to drag icons to the dock, I do not see the white square that
appears when I do the same thing on a machine running Squeeze, and the
icon is not docked (it moves to that location on screen if I release the
mouse button, but is not actually in the dock (can't access the "settings"
menu on right-click, icon disappears after application closes, etc.).

I've tried to add wmclock, iceweasel, gvim, and LXTerminal - all of these
behave in the same manner.  I do have dual displays on this machine, and
have tried dragging icons to the corners of the second display, which also
does nothing.