Unity paints multiple times with multi-screen

I'm amending this bug to track the double paint issue.

This bug was fixed in the package unity - 3.6.6-0ubuntu1

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unity (3.6.6-0ubuntu1) natty; urgency=low

  * New upstream release:
    - drag and drop from dash to launcher issues (LP: #727675)
    - unity-panel-service crashed in g_type_class_meta_marshal (LP: #727788)
    - Dash: first-use text entry does not work until Alt-F2 version is used
      (LP: #735342)
    - compiz crashed with SIGSEGV in g_type_check_instance_is_a()
      (LP: #734721)
    - drag from dash to launcher (LP: #662616)
    - Dash - Create single widget for Dashboard (LP: #683729)
    - [FFe] Recently installed applications should be easy to run
      (LP: #670403)
    - Pressing Alt key does not underline mnemonics (LP: #689179)
    - indicator-appmenu breaks Alt accelerator keys (LP: #663030)
    - can't pin KTouch to the launcher (LP: #693755)
    - Unity paints multiple times with multi-screen (LP: #727116)
    - unitymtgrabhandles crashes when no key is set (LP: #727144)
    - SIGSEGV in PlaceEntryHome::SetSearch (LP: #731927)
    - [launcher] New Default favorites (LP: #714707)
    - Dash: Alt-F2 Pressing enter on the dash can start the first entry of the
      second group from the history (LP: #734738)
    - Dash: keyboard arrow navigation disappears off bottom (LP: #735347)
    - Increase the size of the top left Launcher reveal area from 1px to a 3px
      by 3px square (LP: #736034)
    - [dash] scrollbar's clickable zone should extend to the right border of
      the dash border (LP: #651398)
    - Launcher - Replace Dash lens Launcher icons with updated versions
      (LP: #676613)
    - NuxUtilAccessible requires to implement support to key event listeners
      (LP: #702672)
    - launcher icons dnd doesn't behave correctly when the dash is in use
      (LP: #708885)
    - Keyboard-navigation: highlight stays after losing focus (LP: #713632)
    - Implement AtkComponent for ATK objects in the panel service
      (LP: #715297)
    - Super shortcuts for application place and worskspace swither conflicts
      with compiz keys (LP: #723273)
    - Use DeeIndex instead of strcmp in PlaceEntryHome (LP: #724886)
    - [dash] text cursor not vertically centred in the entry (LP: #724927)
    - Moving cursor in dash text entry field causes cursor artifacts
      (LP: #725493)
    - Missing "children_changed" event emission from the atk support
      (LP: #727137)
    - Typing should immediately search; focusing the search field is fiddly
      (LP: #727295)
    - "Find Internet Apps", "Browse the Web", and "Check Mail" are scattered
      in default Dash (LP: #729009)
    - Press-holding on a icon in the Launcher should de-couple the icon and
      enable the user to reorder the icon vertically without leaving the
      Launcher. (LP: #727922)
    - "Shortcuts" heading in Dash seems pointless (LP: #729000)
    - intellihide is incompatible with totem fullscreen / Still some false
      positive on ws switch (LP: #730679)
    - Launcher - provide visual design for launcher keyboard navigation
      (LP: #702490)
    - Dash - Update the 'Shortcuts' dash home icon (LP: #689763)
    - The Unity panel service Does not connect to the
      INDICATOR_OBJECT...

Just upgraded to Ubuntu 11.04 (inc. unity 3.8.12-0ub) and the Panel is overlaying my 'fullscreen' remote desktop (RDP) session on a dual monitor twinview scenario. I don't know whether or not this is a bug or not :( Because this is a twinview and rdesktop -f has the habit of spanning both screens I've used the common workaround of a script that specifies the geometry of the window and removes the window decoration to mimic fullscreen e.g. the RDP session is launched like :

rdesktop -0 -D -g 1680x1050 <host>

This has traditionally given me a 'fullscreen' on just one monitor. After upgrade however I now have the unity top panel on the second monitor 'pushing' my rdesktop's visible area off-screen vertically, presumably I can adjust the horizontal resolution to match the available pixels, but it would be nice to know if what I've done is legitimate or not ?

I'm commenting on this bug, because the original 'open' bug ( https://bugs.launchpad.net/unity/+bug/688825 ) was marked as a duplicate of this one and suggested I comment here rather than there!