mixer levels don't show

I’ve been using cubase 5.1 for years. No idea what happened when I opened a project I’ve been working on and no levels show in the mixer. I can hear it all and change levels, just can’t see the levels. I’ve opened older projects and the levels don’t show now either.

more info: levels work when I’m plugged in to my usb mixer, but not without it… still works, just no visuals on the levels. Like I said I’ve been using this without problems for years. I switch soundcard drivers when not using the mixer… ASIO4ALL is what I use when not using the mixer.

Help Please and Thanks, Jason