Excel 2007 ribbon issue when in cell edit mode

I have the most basic tab created for the Excel 2007 ribbon, xml at end along with VBA

After Excel starts, if I click my tab, my button is enabled and it works.  After that, regardless of the state my current cell is in if I go back to my tab, my button is still enabled.

However, if when I start Excel I immediately enter something into cell A1, then while still in edit mode I click my tab on the ribbon, I get a beep, and my button is not enabled.  Furthermore, it will never become enabled short of disabling my add-in and reloading, or restarted Excel.
Interestingly enough, if I removed the getEnabled callback, it works fine.  However, if fails in the same way if I try to use a GetLabel callback.

Obviously, the problem is moot if the user is not in edit mode when he clicks my tab.  However, I can't control that.  What can I do to restore my tab to functioning if and when this situation occurs?

Ribbon XML:

<customUI xmlns="http://schemas.microsoft.com/office/2006/01/customui">
            <tab id="myTab" label="ThisTab" >
                <group id="grp1" label="grp1" >
                    <button id="btn1" label="btn1Label" getEnabled="btn1Enabled" onAction="btn1CB"/>

VBA from my xlam file, Module1:
Option Explicit
Private Sub Btn1CB(control As IRibbonControl)
MsgBox "Btn1CB"
End Sub
Private Sub btn1Enabled(control As IRibbonControl, ByRef returnedVal)
returnedVal = 1
End Sub
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Rory ArchibaldCommented:
This is a bug in 2007. AFAIK, it has already been reported and the response was simply that it will not be fixed in 2007. I haven't tested it in 2010, but will try to do so later if I get a chance.

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n_l_devotieAuthor Commented:
Thank you for responding to my question.  What I am chiefly interested in is if there is some reasonable workaround to the problem of reenabling my UI short of reloading the add-in or restarting Excel.  Any word on that?
Rory ArchibaldCommented:
Not that I am aware of, I'm afraid.
n_l_devotieAuthor Commented:
Apparently there is a workaround after all.  If one uses a onLoad="ribbonLoaded" specifier in the xlam file, t hen codes ribbonLoaded to save an instance of the IRibbonUI in the callback as, say, myRib, then invokes myRib.Invalidate from various App and Workbook event callbacks in an associated xla file, then the UI responds correctly.  Note that the tab must be a custom tab for this to work, if one tries to use TabAddIns it fails miserably.
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