Hi all, had a good search around for this but couldn't find anything - hope you can help...

Recently got a N82 off Ebay on o2 PAYG. Phone was hanging and crashing quite a lot on a few applications so i did an SD card format and the infamous *#7370# to restore everything to factory default.

Phone seems a bit more stable now but unfortunately doesn't seem to be able to play MP4 files anymore. It just comes up with an "Unable to play media clip" error. They were playing just fine before the reset, anyone know what the problem could be (I am on the most up to date firmware etc).