ITunes 10.5.3 corrupting MP3's upon import?

Question

I recently upgraded to iTunes 10.5.3 and have added a few MP3 albums since the update.
Various tracks are being corrupted when imported. I have previewed the songs using Finder prior to importing them in iTunes and they play absolutely fine however once added to iTunes they begin to skip and corrupt, especially towards the end of every song. I have checked albums imported prior to the update and they are not affected, it's only new albums I have added since the update.
Has anyone else encountered this? As I say, the files themselves are fine before being added to iTunes but they skip and suddenly cut off before the end of the song when added to the library.
Any advice or help will be really welcome.
EDIT: The songs which are corrupt upon import all fail at approximately 40 seconds before the end of the song, no matter how long the track is.

Answer 1

I do not believe the poster's update to Lion had anything to do with fixing the problem. What fixed their problem was the fact that they re-downloaded the file, not that they updated their OS. I continue to have this problem sporadically with iTunes Match, and my OS and iTunes are fully updated (AND I'm on a fast wired connection via Cable modem, not WiFi).
I've had and continue to have this problem of a small number of songs getting downloaded corrupt when updatings songs via iTunes Match.
Deleting and re-downloading from iTunes Match is the only solution I have found for the problem as I am having it: the songs ARE corrupted for me, and it's not just a metadata problem. When I open the songs in an audio editing program you can see that the audio just isn't there: the data stops before the end of the song (somewhere between 50% and 70% through the piece, usually). So copying it to another computer or re-importing it won't fix anything.
The problem is that iTunes doesn't KNOW which of the songs I've matched-then-downloaded via iTunes Match are bad, and I won't know either until I happen to play one that skips before it ends.
Here's the only solution I've found that will inspect these songs one at a time and list the bad ones:
Create a Playlist of all songs you've downloaded (upgraded) via iTunes Match.
Plug in an iPod (etc.) and wipe out whatever songs are on it already.
In the iTunes setting for that iOS device, tell it to recompress the songs to 128k AAC as it puts the songs onto the iOS device.
Now sync that entire Playlist to the device and wait.
Result: all songs that cannot be down-converted by iTunes to 128k AAC (because the song data is bad) will be listed in the resulting error dialog.
Here's the total suck part: iTunes doesn't let you save that list of errors off to a text file. You have to do one or more screen captures and save off the list, then manually go find those songs, delete them and re-download them from iTunes Match. Total PIA but it's the best I have come up with, since I can find no other utility or means to batch-check that these files are valid.