Hi janrif,
You may find the following info useful:
http://www.zenfolio.com/zf/faq.aspx
What Web browsers are best supported by the Zenfolio site?
Zenfolio is a modern Web service and requires modern Web browsers. The site is best accessed using:
Internet Explorer version 7
Internet Explorer version 6.0 +
The latest version of Mozilla Firefox
The latest version of Safari on Mac OS X
Other Web browsers may work but are not actively tested.
Armstrong