Ok, weird one I have everything working for plaayback and thumnails working for everything else (avi,mkv etc) but while I have mpg thumnails in explorer media player etc I get just black tiles for mpg files in Media center. (the first frame isn't black either, though media center seems to use a frame about 4 secs in for all other files) the same goes for explorer but mpg thumnails are ok there. Any ideas as to cause or a solution? can't understand why mpg thumnails are ok everywhere but media center. Surely if it was a codec issue they would be messed up everywhere.