Previewing Audio Loops

Either it's me or there's something wacky going on with the Preview.
 
From the Media Browser, select a loop I want to audition.
In the Media Tab, I've got Auto-Preview Checked and Loop Preview Checked
 
Now, when i select the Auto Preview Bus, say Bus A, a loop will preview - just once.
click on another loop and it won't preview. If I select, say my main outs, it will preview
But, in order to audition a third loop, I have to set the preview bus back to Bus A
 
Any idea what's going on?
 
Thanks

Works okay for me too, but if you have Loop Preview checked, I think (not sure) the loop has to play all the way through once it's started even if you choose another loop. Try unchecking loop preview, and see what happens.