We're having this error on Win7, NVidia GTX 750Ti, feature level 11.0
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Error calling Map: invalid parameters were passed.
in D3D11DynamicBuffer::map at C:\ogremygui\OGRE19\RenderSystems\Direct3D11\src\Vao\OgreD3D11DynamicBuffer.cpp (line 92)
Since the flag is there for a looooooong time, that means origianlly only vertex/index buffer was using DynamicBuffer? Then at some time point after we last upgraded Ogre (over a year I think), Dynamic Buffer was starting to use on some other buffers. However, none of our Win10 machines have this problem even with feature level 11.0 instead of 11.1, that means the actual driver allows this despite the doc says otherwise.