Center channel cancel problem

I'm using Gordian Knot 0.28, and occasionally (actually it happens a lot) I'll encode a movie that sounds like what I can only describe as the center channel being cancelled. I may be incorrect in that. The dialog sounds really quiet, while sound effects are deafening. Also, music sounds wrong. You can hear the echoes of sounds, but the sound itself is very quiet. I've now had this problem twice in a row, encoding Jerry Maguire and Robin Hood Prince of Thieves, and I need to figure out what's going on. It happens if I use Robot4Rip or if I do the audio encoding manually in GKnot. I'm using the default audio encoding command-line arguments in Robot4Rip, but I also get it if I use the "surround" arguments that used to be recommended in the Doom9 guide. (It's now recommended to use Robot4Rip.) Anybody know what's going on here?

You're going to need to supply more information. The fact that you're using the GKnot frontend has nothing to do with your audio problems. Post your ( i'm assuming BeSweet ) log. Sounds like it could be a DRC or surround downmix problem of some kind.

Are you using the AC3 files or MP3 files? I'm assuming it's MP3 because your using besweet. If that's the case then try to make your MP3's from the Stereo Soundtrack instead of the 5.1 track if you haven't done so already.