Somethinhg like that. I don't think it's your vid card.
Unless the game has an issue with geforce cards, but I doubt that too.
Another edit
Sorry I initially only read your post to the point of standby in monitor. If you make into the game, then I don't think it's your monitor either.
While in windows, go to Ryzom in your start menu, and look at the settings under Ryzom Setup.
I don't know the capabilities of that particular geforce card, but maybe something is checked that the card doesn't support.
I have a radeon9800pro, but during long Doom3 tweaking sessions, I had all sorts of irregularities come up
I hope something here is helpful