Please bump mythtv 0.20 package to at least svn revision 11299 of release-0-20-fixes or include patch mentioned in http://svn.mythtv.org/trac/ticket/2438. Patch fixes upstream problem mentioned in http://svn.mythtv.org/trac/ticket/2438 and have also been applied to release-0-20-fixes branch. In short it fixes an infinite loop in mythbackend. Thanks.
rev bumps happen at a semi-regular interval... (basically when I have time and when my Myth box isn't broken...) it will happen.
Fixed. mythtv-0.20_p11444