Black Screen Crash

[Pips]

To help anyone with working out my problem here is some extra info:
Please Note: I'm getting the black screen crash once I'm up and flying around, not during 'game load' or at 'main menu', as most folks who report the problem seem to be experiencing.

a) I run Windows 7 Home Premium 64-bit
b) I turned off the 'epilepsy filter'; it was causing a psychedelic effect with the instrument dials in the cockpit.
c) Video Options
Resolution: 1680x1050 60Hz
Full Screen: On
Detail Level: High
Model Detail: High
Building Detail: high
Land Detail: High
Visul Effects: Medium
Texture Quality: High
Anti-Aliasing: 4x
Epilepsy Filter: Off
SSAO: Off
VSYNC: Off
Damage Decals: High
Building Amount: High
Land Shading: High
Grass: On
Shadoqs: Off
Roads: On
With those settings when I fly (for the couple of minutes before the game crashes) it is quite smooth. And that's over land - Dover. No jumping, no shudders etc.

d)
7.Q: I am running Windows Vista / 7, and my game constantly crashes.

A: You have most likely manually reset your render to use DX9. Cliffs of Dover only supports DX9 on Windows XP. Please use DX10 on DX10-capable operating systems, as switching to DX9 actually reduces performance, in addition to leading to unexpected crashes.
unquote


I had a look at the FAQ, and this was the only one that may be causing the problem. Most folks who report a 'black screen' do so at loading or the main menu point. My problem is actually once flying in the game.
But I'm unsure how to check if I'm running DX10 in Win 7.
Any suggestions?

Cheers