When I used *.MP4 file extension the ActiveMovie Window pops up,
But when I rename it to *.mp4 it works perfectly.
[Video]: Bitrate:2999kbps, Resolution:1280x720, Framerate:29.970 fps, Codec:AVC
[Audio] Bitrate:192kbps, Sampling rate:44.1KHZ, Codec:AAC
(Directly ripped from Youtube)
[OS] Win7 x64
[PPD version]0.6.11.5
[Decoder]ffdshow x64 1.2.4466(bundled)
[DrawMethod]both

Just to inform, maybe you want to fix it.

OK, I found why it happens.
I will fix it in next update.