C'est à cause d'applications qui utilisent d'anciennes versions MyODBC 2.50, et qui ne donne pas de nom explicite aux curseurs, via SQLSetCursorName. La solution est de passer à version MyODBC 3.51.
This is a translation of the MySQL Reference Manual that can be found at dev.mysql.com. The original Reference Manual is in English, and this translation is not necessarily as up to date as the English version.