This is a problem due to Ryzom using older versions of DirectX, have a look at this post: http://app.ryzom.com/app_forum/index.php?page=topic/view/20605/1# 1
It is originally made for earlier versions of Windows, but the fix seems to work for Win 10 as well.
It is originally made for earlier versions of Windows, but the fix seems to work for Win 10 as well.
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TiximeiSenior Game Master
Ryzom Support Team