Your problem is known and only occurs with D3D, please could you try OpenGL driver instead ?
The issue is : https://bitbucket.org/ryzom/ryzomcore/issues/160/wind-tree-vp-not -working-correcly-under
The issue is : https://bitbucket.org/ryzom/ryzomcore/issues/160/wind-tree-vp-not -working-correcly-under
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Kervala - Ryzom volunteer developer - Working on different clients