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Update: I tried installing DirectX 9 using the normal installer (the one which downloads what's needed) but that didn't solve the issue - neither did installing the latest NVidia drivers. So... what I did next was to get the full DirectX runtime install package and copy the file which was causing the issue (d3dx9_41.dll) over from the cab file in that package to the windows\system32 folder (renaming the one the was already in the windows\system32 folder just in case) - and all of a sudden, it all works! I'm not entirely sure what the issue was as both files seem the same, and I don't know why V1.01 worked, and V1.02 didn't, with the old file (surely they didn't just start using a function as fundamental as D3DXMatrixMultiply in V1.02? and why is this apparently missing in the d3dx9_41.dll I already had?) - who knows, but I'm very happy again now :-) Thanks for all replies!

Ok - it's looking like a definite DX9 install then... thanks for replies.

Thanks, I shall give that a go when I get home...

Thanks a lot for the reply. Yes, 'D3DXMatrixMutiply' is a DirectX function contained within one of the DirectX dll's. What I don't understand though is why would V1.02 patch cause the DLL link to this function to screw up? and yet, reverting to V1.01 corrects the issue? I'm running Vista (32-bit) which comes with DX10 pre-installed - I presume all DirectX versions contain all previous versions (being a COM library) so I'm not sure whether I can do anything as regards the DX9 installation? Does ArmA2 use DX10 at all? or is it all DX9? Thanks again.

Hi, I've been running the version of ArmA 2 that was on the DVD without issue (V1.01) but after installing the V1.02 patch the game refuses to start, instead popping up a dialog box immediately with an error about "d3dxmatrixmultiply" not being present in a directx9 library (sorry I can't be more specific as I am not at home at the moment) I've tried uninstalling and reinstalling - but same thing happens - V1.01 works fine, but then I put the V1.02 patch on and get this error. I'll try updating my NVidia drivers tonight and I'll post additional/more specific information about my system should that not resolve it. Thanks in advance for any help.