Back when I was able to take screenshots, I empied them periodically to another directory.
Also, there is no longer a message when I enter the keystroke LAT-F10.
I use the official version of Ryzom (didn't know if ther was an "unofficial" version.
I will have to check and see if my Linux keybindings have changed.
so if there is no message the keystroke is a)not alt-f10 (changed) b) "captured" by your windows manager. Try to set it to something not used, like shift+alt+F10 (try a couple of different keystroke to be sure).