Lock screen not showing wallpaper

[CalMin]

I'm pretty happy with Lion so far. No major bugs and performance has been zippy on all machines. I'm even used to the reverse scrolling!

Quick question though. I love that the wallpaper shows on the lock screen on my MacBook Pro. However, on my Mac Mini it's missing! I just have the Lion style lock screen with a black background.

Any ideas how to show the background?

 

[iamn]

same on my MBP that runs Lion