Cubase 6 - Audio Drivers Not being recognised!

I’m having a problem with Cubase 6 where it has suddenly stopped recognising my soundcard drivers, thus meaning that I can’t hear anything back through my monitors and no levels are showing within the program. I am using a Focusrite Saffire 6 Sound card.
When I select the ASIO DirectX Full Duplex Driver I can hear things fine through my computer speakers, however this isn’t all that helpful for monitoring.hah.
I have already tried uninstalling and re-installing the drivers, with no luck.

Has anyone else had something similar happen and found any solution?

I am in the middle of a very urgent project with a deadline, so any help would be greatly appreciated!

Thankyou.

post your system specs. Sorry I am on a mac so I am not much help but for anyone cruising they will probably need more info to be of any help

phi