This bug is not consistent in its behaviour, but
sometimes will happen when the user answers a
question. It doesn't affect Pavlov much, other than to
spam any open console window. It is apparently in the
BoxLayout code used to layout HTML in a JEditorPane.
I looked carefully at the HTML and didn't see anything
out-of-sorts. I assume it's a Java bug. I put a catch
around it in net.sourceforge.sillyview.HTMLPane -- look
for "Caught Odd Layout Exception" in the code...