The firmware upgrade that was released yesterday causes files encoded with Videora to stutter and lose the audio. You can restart the video to regain the audio, but after a few seconds it happens all over again, making the videos impossible to watch.
Dammit, over vacation I re-encoded all my videos with Videora. The “House Tour” video stutters, as do lot of the TV shows I’ve downloaded. The culprit is probably the x264 open source encoder, which is mush faster than Apple’s, probably because it doesn’t do as much error checking.
I haven’t been able to find a working link to the firmware updater from 11/2005, so your best bet is to dig up the CD-ROM that came with your iPod.