There are three causes.  Josh solved it and it is documented in the middle of this thread:<div><a href="http://www.gossamer-threads.com/lists/engine?do=post_view_flat;post=347546;page=3;sb=post_latest_reply;so=ASC;mh=25;list=mythtv">http://www.gossamer-threads.com/lists/engine?do=post_view_flat;post=347546;page=3;sb=post_latest_reply;so=ASC;mh=25;list=mythtv</a></div>
<div><br></div><div>There is a setting, a version of fixes, and a patch that Josh wrote.</div><div><br></div><div>Allen</div>