What drivers are you using Typhoon? You got it working with new drivers and no beta drivers? HOW!?
After the official Powerdesk kept installing the wrong widescreen resolutions with 180.xx drivers, I uninstalled it. Then installed TH2Go monitor driver manually (using update driver option in windows control panel) and set up custom res 5040x1050@57 (had the infomous custom res failed message - despite the screen showing the correct picture- a few times but it cleared when I swapped DVI ports and then worked fine with either). So basically got it working without using Powerdesk. Then installed the official powerdesk (only to get bezel management) but did not install any new widescreen modes (it was these that dont install correctly)