Hi Dennis,
As Nick suggested, those are very important troubleshooting techniques you need to start with, and it is important to use your error reporting whenever you come across an issue. :-)
However,
I have spent some time trying to figure out this issue on your website tonight, only because your issue really intrigued me!
I noticed a JavaScript error on your webpage, which is caused by your Iframe trying to do a cross-site script.
First off, as for security measures, you cannot create an iframe that takes you to another domain name.
Let me explain:
Your domain that doesn't work:
advancednaturopathics.com.au/index.php/learning-centre Your domain that DOES work:
www.advancednaturopathics.com.au/index.php/learning-centre The IFRAME URL you are trying to reach:
www.advancednaturopathics.com.au/moodle/?a=1 Because your non 'www' website does not have 'www' in it, it is recognized as a security vulnerability and all servers will reject the onLoad of that iFrame.
So to fix this issue, you need to redirect your website to a www domain using you htaccess file.
Here is some information on that:
www.boolcast.com/joomla/miscaleneous/joo...irect-non-www-to-www