Firebox plays stereo as mono

I'm using the Firebox with Cubase.
In my cubase project I pan a track 100% to the right, but when I play it still it sounds in the center.
I tried swritching to the PC Asio Driver and then it worked fine (playing the track only in the right speaker), so there's a problem with the Firebox. I guess that it's a preference that needs to be checked. I didn't find it in the mixer...
It used to work fine in the past, but i'm not sure what's changed.

Any ideas?

Sounds like something's not ticked off right in Cubase or it might possibly be a hardware problem with the Firebox
itself. I suggest you try using the Firebox with some other audio app........something simple like a standalone synth
or VST host.