DockLayoutPanel and StackLayoutPanel problems in IE7

Hopefully someone can help with this issue. I hvae been working on it
for 3 days without success. I am trying to get a StackLayoutPanel to
display inside a DockLayoutPanel.

GWT 2.1.0, mvp4g 1.2.0, GXT 2.2.1, standards mode, IE7

Its actually a bit more complex than that...

We have developed 4 stand alone modules that we are now integrating
into a 5th Navigation Module. 3 of the original modules are in GXT
and they display just fine. The original GWT module was working
perfectly using DockPanel and StackPanel. However, I'm being forced
to get rid of deprecation compiler warnings, so I need to move to
DockLayoutPanels and StackLayoutPanels. Now, my original GWT package
no longer renders in IE7 when it is a child module to the Navigator.
The bizarre thing is that it works in FF 3.6.10, but NOT IE7.

I have searched the web extensively for a solution and have attempted
many things to get it working:
-set sizes on all panels
-set the same Unit types on all panels (using PX right now)
-using RootLayoutPanel (rather than RootPanel)

Frustratingly, my original GWT Module still works fine when its not a
child module to the Navigation module.

Here's how I'm using the panels...

Level 1 - Nav module - LayoutPanel (4 items, the 4th is a
DockLayoutPanel)
Level 2 - Nav module - DockLayoutPanel (Center is another
DockLayoutPanel, South is reserved for other add-ons)
Level 3 - Child module - DockLayoutPanel (North is a TabBar, Center is
a DockLayoutPanel)
Level 4 - Child module - DockLayoutPanel (East has some widgets,
Center is a StackLayoutPanel)
Level 5 - Child module - StackLayoutPanel
-each panel in the stack is a VerticalPanel or HorizontalPanel
containing lists, buttons, and text entry fields.

Strangely, when Level 4 and below is the old DockPanel and
StackPanels, it all works great.

Any ideas? Thanks in advance!!!!

-mike

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