In the Standard.xml file, when a "draggable" attribute value is set to false as is allowed per the defined DTD schema (-//NetBeans IDE//DTD toolbar 1.1//EN), the following error occurs: "A org.openide.util.RequestProcessor$SlowItem exception has occurred."  Also, there doesn't seem to be a way in the IDE to adjust this attribute. 

In the below example, "draggable" is set to false for the File toolbar in the Standard.xml file.  When opening up the IDE the following error is seen: "A org.openide.util.RequestProcessor$SlowItem exception has occurred." 

<?xml version="1.0"?>
<!DOCTYPE Configuration PUBLIC "-//NetBeans IDE//DTD toolbar 1.1//EN" "http://www.netbeans.org/dtds/toolbar1_1.dtd">
<Configuration>
  <Row>
    <Toolbar name="File" visible="false" draggable="false" align="left"/>
    <Toolbar name="Clipboard" visible="true" draggable="true" align="left"/>
    <Toolbar name="UndoRedo" visible="true" draggable="true" align="left"/>
    <Toolbar name="Build" visible="true" draggable="true" align="left"/>
    <Toolbar name="Debug" visible="true" draggable="true" align="left"/>
    <Toolbar name="Memory" visible="true" draggable="true" align="left"/>
    <Toolbar name="QuickSearch" visible="true" draggable="true" align="right"/>
  </Row>
</Configuration>

Thanks.