title: Cannot paste from xlsx to xlsm
body: <p>The strangest thing is happening to me. I have an xlsm workbook with a number of macros at all levels (general, worksheet, workbook). All works as expected with it, but if I try to copy some cells from an xlsx workbook and paste them into my xlsm workbook, the <code>Paste</code> option is grayed out. Ctrl-V also doesn't paste. I tried</p>
  
  <pre><code>application.commandbars("cell").reset
  </code></pre>
  
  <p>in the Immediate window. That didn't seem to do anything.</p>