Can not see 'preview option'

On the iphone settings, I don't see the little button on the top right to 'preview in mobile mode'.

Versions:
Joomla 3.2.4
php 5.3
mobile joomla , Pro 1.2.10

I also noticed that I can't save my configuration, when I try to turn it on, it just doesn't do anything...maybe it is related?

thanks,
LAura

Laura,

Check that "Mobile Joomla Pro" plugin is enabled and that administrator/components/com_mobilejoomla/config.php file is writeable.