I have a Sony X Series Walkman and a Zune HD. I have tried almost all the mobile options for Mpeg4 and WMV. With some of them they do not start at all but sit at 0%. Sometimes it will do task 1 of 2 then get stuck before starting tast 2. Some have video/audio alignment issues when it does work. I have a brand new HP Envy and even tried on my GF's gateway getting the same issues! Any ideas?