The problem is solved.Or kill the nautilus process with the About This Computer tool. Inany case, I'm using nautilus-open-terminal here on F11 without a problem, and although I'm still trying to solve a minor problem with the tool, as the maintainer of the package I can tell you it works.
I did " yum update nautilus-open-terminal" , then rebooted and then it was working again.
The funny part is that I tried this before without succes.
Anyhow I'm glad I have it back.