the best thing to play mkv files is vlc or media player classic 321 most but not all video file formats really don't like being fastforwarded much the only ones i have had no problem fast forwarding in media player is mpeg typ codecs.
The point is that I used to be able to play the same mkv files I'm trying to play now, and I used to be able to seek through them at my liking.
Using VLC is not an option, since I genuinely dislike it ;). Besides, I want to use one player for all my media, which I normally have with Windows Media Player.
I don't recall installing anything special that could be causing it, so I'm just wondering if anyone else has ever experienced this.
I fixed it with a reinstall of Windows, was about time anyway.
By the way, getting MKV to play in WMP is just a matter of installing Haali Media Splitter (MatroskaSplitter). In my case it was installed in conjunction with CoreAVC, and now I can just play and fast forward as much as I like again.