Has anyone had this problem on a PC? The new podcast export from imove, .m4v PC do not recognize, so you have to upgrade to quicktime7, then when opening the imovie, the PC asks you if you want to change the mime type, which alows you to then use your quicktime .m4v
test it here: http://www.darylurig.com/daryl-Urig-Video-Blog.html Daryl
