When Joomla is installed on a sub-domain, the Joomlart templates are not fully functional.
This issue is similar to what was described here, but the wrong things were focussed on there:
http://id.joomlart.com/forums/topic/template-layout-backend/
The issue affect the template Layout configuration area, and the MegaMenu manager.
These are not functional when the Joomla installation is on a sub-domain.
(I tested it on a new Joomla installation, on both a regular domain, and a sub-domain, to compare and confirm)
To-reproduce error:
– Install Joomla on a sub-domain (with test data installed)
– Install latest Purity III or the t3 blank template
– Install latest T3 Framework Plugin (currently 2.5.1)
– Go to the Template Layout settings.
– Notice that no layout positions are visible
– Also click on the MegaMenu button, and notice that no menu links are displayed.