oggenc -b 96 produces .ogg with screeching noise

While encoding 150 CDs, I hit a glitch in "OggEnc v0.8 (libvorbis rc2)"
Playback produces nasty screech/hiss in XMMS/Linux and WinAMP/Win32.
(Yes, I checked the source .wav file, it's perfectly fine.  I tried
encoding the good .wav both on a PII/400 and XP1900+, same problem.)

artist: britney spears
album: oops i did it again
track: #9, 0:55 through 1:45
(3 or 4 blips)

Otherwise, it's been most excellent!

An interesting note is that I bonk'd the wav (freshmeat: bonk)
in lossy mode and debonk'd it, then it encodes fine.  But that's
expected, I'd guess.
Shall I try to isolate a small section of the original .wav?