Why do I get black screen when using byzanz on Fedora 20?

edit

Note: I don't have enough karma to make the links - actual links :)

I have installed Fedora 20 latest beta as of 2013-12-05 in virtualbox. I want to be able to quickly make screencasts as animated gifs.

For this purpose I have been using byzanz (git.gnome.org/browse/byzanz/) on my ubuntu box. I got hooked on byzanz after a post in ubuntu Q&A(askubuntu.com/a/123515/28253) describing how to set it up.

I successfully used in on ubuntu, both 13.04 and 13.10. It's wonderful.

However when I record the desktop in Fedora the only thing in the outputed GIF is my cursor moving. Everything else is black.

I use this command to test it:

byzanz-record --duration=15 --x=200 --y=300 --width=700 --height=400 out.gif

I have installed byzanz via:

sudo yum install byzanz

Is it something to do with wayland support? Is it something to do with GNOME 3.10? Any ideas how to fix it?