text vanishes when clicked upon

Strange and annoying problem: when clicking on text, it vanishes and reappears after unselecting.

Try at http://www.rosannephilippens.com/

I used the WP Fontface plugin in the Responsive Pro them.
What causes this problem??
Thanks in advance!
Martien

http://ww.wp.xz.cn/plugins/wp-font-face/