I created a
sites/all/themes/mySubtheme/templates/node--page.tpl.php in a Omega subtheme.
I cleared all caches but it is not detected at all.
I even try with
sites/all/themes/mySubtheme/templates/node.tpl.php to theme all nodes, just in case that I would have a typo error, but not working.
The base of my subtheme is omega:
base theme = 'omega'
I've also made sure that the tpl.php file exist in: