H264/AVC in MP4 playback troubles

[Brazil2]

I don't know what happened on my system but some MP4 videos with H264/AVC don't play properly anymore in WMP, Graphedit / GraphStudio and even MPC-HC. I just got a black screen. But some other ones are playing fine.
It doesn't matter if I'm using the Arcsoft MP4 Splitter or the internal built-in splitter of MPC-HC, the result is the same: a black screen. It seems to happen with H264 videos only as I have no playback problems with XviD/DivX in MP4.

This one doesn't work:
http://www.megaupload.com/?d=FC0N2P8O
MP4 videos grabbed from Youtube by using this method (http://forum.doom9.org/showthread.php?p=1113914#post1113914) don't play either.

But this one works:
http://trailers.nerodigital.com/Warner/GetSmart_HD.mp4
The videos from this post (http://forum.doom9.org/showthread.php?p=1230259#post1230259) are playing fine as well.

And it doesn't matter which H264 decoder or which renderer is used. The strange thing is that it seems to detect the size of the video because the window is resized to match the appropriate size before the playback, but still I got a black screen.

All of these videos are playing fine in VLC though. And I'm quite sure I could play them in WMP and MPC-HC previously.

Any ideas ?

[Pulstar]

Well these things happen.. try one of the following
1- Set ffdshow's output to RGB32 and make it the preferred AVC decoder
2- Uninstall your vidcard drivers and then download and install the latest ones (after rebooting of course)
3- Try various renderers. You could have triggered a glitch in VMR9 or EVR

If all else fails you might want to do a clean install of Windows.