.m4v files have random generic icons

Hi everyone,

Since upgrading to Lion all my movies now have random generic icons. They still work, but before upgrading to Lion & iTunes 10.4 they had the correct iTunes icon, now they look like this;

Funnily enough, before Lion (using Snow Leopard), the film 'Babel.m4v' used to be the only movie that kept being associated with QuickTime Player, whilst all the others were associated with iTunes. Now, for some reason, Babel is the only film with the correct association! The movies with white icons and the 'exec' icons will open with iTunes and they are set to open in iTunes if I choose Get Info;

I've rebuilt the Launch Services database and updated the locate and whatis databases but it's had no effect - still looks the same as above.

Any ideas? Anyone else having this problem?

Jamie