Try the setting the Game resolution to "Windowed" and the level of details "Normal" from the game login screen.
You could also try the alternate option with the configuration program and set to OpenGL in preference to "Auto" or "Direct3D"
If neither works delete the \ryzom\unpack directory ... this will force the game to reinstall the latest patch.
The latest patch did have some issues with some resident antivirus programs so you might want to "temporarily disable" resident scanning for the duration of the patch.
You could also try the alternate option with the configuration program and set to OpenGL in preference to "Auto" or "Direct3D"
If neither works delete the \ryzom\unpack directory ... this will force the game to reinstall the latest patch.
The latest patch did have some issues with some resident antivirus programs so you might want to "temporarily disable" resident scanning for the duration of the patch.