You are using the "DNG" setting, not "MLV", right?
I just did a re-test for "Simple" and "Slit-scan" features with DNG and they are working fine on my 7D.
Please redo your test after resetting ML to defaults.
Load silent.mo and (optional) file_man.mo, pic_view.mo, mlv_play.mo.
Do *not* activate "Use Autofocus" feature, it is broken!