JVC XVN410BK Progressive-Scan DVD Player , Black
Must be a design flaw
Several reviewers have pointed to a problem with the unit freezing at chapter boundaries and also occasionally breaking up into large pixels.  However, being an optimist, I figured this was just the few people that got a bad unit and there must be hundreds of others who have working units and didn't bother to write a review.  Right?  WRONG!  I bought the XVN410BK's twin (the XVNP10S which has all the same stuff but adds multimedia card reader).  It has all the same problems reported by the other reviewers.  I'm guessing this is a design flaw in either the processor chip(s) or the laser/drive unit.  Guess I'll be buying some other brand from now on!