[Plugin: WP-prettyPhoto] Remove image title

This my be a silly question but how do I remove the highlighted title in the linked image?

https://lh6.googleusercontent.com/-16Ni0oOaav4/TuKAYVEmXxI/AAAAAAAAAyA/O-hN-55gBpE/s896/Fullscreen%252520capture%25252009122011%252520214055.jpg

I have ticked and un-ticked show title in the prettyphoto settings but not changed anything.

Thanks

http://ww.wp.xz.cn/extend/plugins/wp-prettyphoto/