same problem with me here with WLMM 2012, after publishing the project (saved to computer) and playback the video, it shows no video but only music.. i've tried the other WindowsMovieMaker and the saved movie works fine with WMM 6.0 or  WMM 2.6 (but i still like to use WLMM 2012 because of its simplicity and compactness)... i've tried updating drivers, use compatible file format (wmv, wma) but still the same results..no video only audio.

any advice on how to deal with this problem?