Q:

Custom Ribbon command greyed out in IE8

I have created a simple Ribbon command that hides the header, footer, and ribbon via jQuery.  It then calls window.print() and unhides the previously hidden divs.  It works great on my development machine using IE9, and works everywhere using Chrome or Firefox.  Unfortunately it does not work in IE8 in production.  I tried reverting to IE8 to test but was unable to.  
Can you think of anything that could cause my ribbon to be greyed out?  My simple code can be found below:
<?xml version="1.0" encoding="utf-8"?>
<Elements xmlns="http://schemas.microsoft.com/sharepoint/">
<CustomAction
  Id="SharePoint.Ribbon.NewGroupInExistingTab"
  Location="CommandUI.Ribbon">
<CommandUIExtension>
  <CommandUIDefinitions>
    <CommandUIDefinition Location="Ribbon.Templates._children">
      <GroupTemplate Id="Ribbon.Templates.NewGroupInExistingTab.OneLargeExample">
        <Layout Title="NewGroupInExistingTabOneLarge" LayoutTitle="NewGroupInExistingTabOneLarge">
          <Section Alignment="Top" Type="OneRow">
            <Row>
              <ControlRef DisplayMode="Large" TemplateAlias="Button1" />
            </Row>
          </Section>
        </Layout>
      </GroupTemplate>
    </CommandUIDefinition>
    <CommandUIDefinition Location="Ribbon.WikiPageTab.Scaling._children">
      <MaxSize
        Id="SharePoint.Ribbon.NewGroupInExistingTab.NotificationGroup.MaxSize"
        Sequence="15"
        GroupId="SharePoint.Ribbon.NewGroupInExistingTab.NotificationGroup"
        Size="NewGroupInExistingTabOneLarge" />
    </CommandUIDefinition>
    <CommandUIDefinition Location="Ribbon.WikiPageTab.Groups._children">
      <Group
        Id="SharePoint.Ribbon.NewGroupInExistingTab.NotificationGroup"
        Sequence="15"
        Description="Print Page"
        Title="Print"
        Template="Ribbon.Templates.NewGroupInExistingTab.OneLargeExample">
        <Controls Id="SharePoint.Ribbon.NewGroupInExistingTab.NotificationGroup.Controls">
          <Button
            Id="SharePoint.Ribbon.NewGroupInExistingTab.NotificationGroup.Print"
            Command="NewGroupInExistingTab.Command.Print"
            Sequence="10"
            Image16by16="/_layouts/Redacted/Images/Print16.png"
            Image32by32="_layouts/Redacted/Images/Print32.png"
            Description="Print the current page."
            LabelText="Print the current page"
            TemplateAlias="Button1" />
        </Controls>
      </Group>
    </CommandUIDefinition>
  </CommandUIDefinitions>
  <CommandUIHandlers>
    <CommandUIHandler
      Command="NewGroupInExistingTab.Command.Print"
      CommandAction="javascript: 
      $('div#s4-ribbonrow').hide();
      $('div#Redacted-header').hide();
      $('div#Redacted-footer').hide();
      $('div#grid-gutter').css('margin','0');
      $('div#Redacted-wrapper').css('margin','0');
      window.print();
      $('div#s4-ribbonrow').show();
      $('div#Redacted-header').show();
      $('div#Redacted-footer').show();
      $('div#grid-gutter').css('margin','0 auto');
      $('div#Redacted-wrapper').css('margin','0 auto');
      "/>
  </CommandUIHandlers>
</CommandUIExtension>
</CustomAction>
</Elements>

A:

ISS reset and clean browser cache (Dev Tools), could work.

