[AccessD] Ribbon problem

The Access 2007 I am working on has lots of custom ribbons. The print  
preview on the report is giving me problems intermittently. The close  
print preview button will gray out and become disabled. I have not  
been able to figure out why, but I have been able to reproduce it  
pretty consistently when I select a criteria from a pop up form. This  
is not the only time it shows up, but the only one I can reproduce.  
Using the default ribbon on this same report has a working close print  
preview. I am including a copy of the ribbon XML in the hope that  
someone can spot an obvious problem I cannot.

<?xml version="1.0" encoding="utf-8"?>
<customUI xmlns="http://schemas.microsoft.com/office/2006/01/customui"  
onLoad="onRibbonLoad">
<commands>
<command idMso="FileExit" enabled="false"/>
<command idMso="ApplicationOptionsDialog" enabled="false"/>
<command idMso="FileCloseDatabase" enabled="false"/>
</commands>
<ribbon startFromScratch="true">
<officeMenu>
<button idMso="FileOpenDatabase" visible="false"/>
<button idMso="FileNewDatabase" visible="false"/>
<splitButton idMso="FileSaveAsMenuAccess" visible="false"/>
</officeMenu>
<tabs>
<tab id="tabReportPreview" label="Report Preview">
<group id="grpCommands">
<button idMso="PrintPreviewClose" size="large"/>
<button idMso="FilePrintQuick" size="large"/>
</group>
<group id="grpExport">
<button id="cmdExportPDF" label="PDF" size="large"  
imageMso="PublishToPdfOrEdoc" onAction="ExportToPDF"/>
<button id="cmdExportHTML" label="HTML" size="large"  
imageMso="ExportHtmlDocument" onAction="ExportToHTML"/>
<button id="cmdExportRTF" label="RTF" size="large"  
imageMso="ExportWord" onAction="ExportToRTF"/>
<button id="cmdExportExcel" label="XLS" size="large"  
imageMso="ExportExcel" onAction="ExportToExcel"/>
<button id="cmdExportExcelCustom" label="Custom XLS" size="large"  
imageMso="TableInsertExcel" onAction="ExportToExcelCustom"/>
</group>
</tab>
</tabs>
</ribbon>
</customUI>


TIA
Debbie


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