Problems with compilation albums

My ipod touch has about 6000 songs on it, many in compilation albums. I uploaded a few new CDs onto iTunes today and then synced them onto the ipod. I now find that every compilation album on the ipod has been broken up into a number of albums.

For example, I have 4 tracks from Now 65 on itunes. Since the last sync the album view on the ipod has 4 entries for this, each of which has the same 4 songs. However, there is only 1 entry on iTunes, with 4 songs.

So, iTunes is displaying things correctly but not the iPod

For ths particular album I have made sure that the album artist is the same for each song (set to Various Artists) and that the disc number box has 1 of 1 for each song.

Changing Group by album artist on the ipod does not make any difference

Some of the compilations have the correct artwork for some entries on the ipod album list but not for others which is really wierd.

I have iTunes iOS 5.1.1

Is there a way by which I can have all the tracks on a compilation grouped together on the Pod like they are on iTunes (and i am sure they were previously)

Thanks

via iLounge Forums http://forums.ilounge.com/ipod-touch/279811-problems-compilation-albums.html