I had issues with the client in Debian with Nvidia, If your system is 64bit try the 64bit client. for some reason, at least on mine Debian (Jessie) did not load the 32bit parts of the driver for Nvidia correctly causing a lot of random crashes. After switching to the 64bit client, Ryzom is a lot more stable
http://app.ryzom.com/app_forum/index.php?page=topic/view/21393/7# 7
http://app.ryzom.com/app_forum/index.php?page=topic/view/21393/7# 7
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FateciyGaurdian of the Kingdom
Guild Leader of Spears of Eora