I installed Ubuntu 12.04 (x64) and was really enjoying it, but it was a little too slow on my machine, so I've reinstalled with the x32 version (hopefully that terminology's correct). The only thing I did differently was to put the /home directory onto its own partition and set encryption of same.
When I used the x64 version, the login screen would change to show each user's desktop wallpaper, but it no longer does this... Is this a bug? Or something wrong with x32? Or is it something that I did when I partitioned and encrypted /home?