Yeah, it's not a frequently-occurring case. But, nevertheless, I was ripping a CD that came along with my Japanese textbook. It had two cds; one reported 98 tracks and one reported 99 tracks (all the tracks are between 15 seconds and 1.5 minutes).
The 98-track CD had no problems (yay!) but when clicking the "rip" button or adding the tracks to a playlist for the 99-track cd, foobar would give an error that it cannot read the 99th track's data due to it being "corrupt or an unknown format".
A little messing around and when I added it to a playlist, the 99th track cannot be touched (it leaves its title as the-cd-id,99 (not literally, of course)), trying to play it or edit its information results in the same error message, and it causes the 98th track to only play silence (the 98th track on the 98-track cd was fine). Windows Media Player (ugh) plays and rips the 98th and 99th tracks properly--I ended up doing that lossless and then compressing the two resulting files the way the rest were compressed.

It's a rare error, but it exists...

I noticed that the change log for 0.9.5.5 states that 99-track handling has been fixed--however, having upgraded I've tried the CD again and I still get the same error. I tried deleting the cddb entry and restarting with no effect.
Adding the cd to a playlist gives the following error:

Track 97 plays properly. Track 98 is silent and doesn't even spin up the CD.
Trying to play track 99, again, gives the error:

and moves onto another track (random in this case since it's on shuffle).

If anyone needs the CD image to help in debugging, I'd be happy to send it.