When a message is output from within a timer script, there doesn't appear to be any subsequent realignment of the command bar, so it (and some of the text) can disappear off the bottom of the screen. Scrolling will bring it back but it would be better if alignment occurred automatically. Is this a known bug? Is there a workaround?

You mean a JS timer?
Try using addTextAndScroll() rather than addText().

Sorry mrangel, just meant a standard Quest timer, as in:

  <timer name="game timer">
    <interval>2</interval>
    <script>
      msg ("...")
    </script>
  </timer>

...just found something that works JS.scrollToEnd ()! Problem solved!!