Hi I have a problem with Media Player Classic. I was watching a series and it was in .ogm format and I got this message popping pop saying: Media Player Classic could not render some of the pins in the graph, you may not have the codec or filter on teh system. The following pin(s) failed to find a connectable filter: Audio Switcher :: OUT Stream 1 CoreVorbis Audio Decoder AC3Filter Audio Switcher The funny thing about is that I have AC3Filter and it suddenly just stopped working. Could you please help me diagnose my problem please? Thanks in advance! BTW I know what codecs are but waht do they stand for?