that program came with my cam. most worthless peice of software i have ever tried to use. if you have access to a high speed connection, download pinnacle studio. super easy to use and it has a decent amount of features for basic video editing. my assumtion here is that you are trying to upload the image mixer workable files, i.e. projects you havent rendered yet. that would cause the videos to not work. so try rendering and then uploading, but do yourself a favor and get a better program to edit with.