Fast User Switching & Log Out

I've run into what I suspect is a user switching bug in Lion, but it's so obvious I have trouble believing it was released like this and isn't unique to me.

If I'm using account A, switch to account B, and then attempt to log out, it fails. Account B just refuses to log out.

However if I then switch back to account A, I discover it received the log out instruction and is displaying the "Are you sure you wanna?" dialog.

At that point, it's effectively impossible to log out of account B without restarting.

Anybody else?

Thanks,

Bryan