pmp & psplayer trailing picture HELP

[Gus]

Hi, i hope someone can help me. Im having big problems playing video, iv tryed both pmpmod and psplayer and im having the same problem with both.Im getting the previous frame left on the screen which makes it nearly un-watchable (like a trailing image simlar to if you set your computor mouse to trail) At first i thought it was my computor and a codec problem so i tryed with someone elses computor and still the same.Iv tried all the converters and all the settings but its always the same. Please help (im running original fw 1.5 with sony 2gb memory stick) JUST TRYED THE HELLBOY PMP VERSION AND IT DOES IT ON THAT TOO SO IT MUST BE A PSP PROBLEM, ANY IDEAS??