lat9:
Unfortunately, Rod, it doesn't help. The file tpl_modules_shipping_estimator.php doesn't exist in the template-override directory
This is the problem. Why doesn't it exist? (Generally insufficient permissions for ozpost to create it).
lat9:
and it hasn't been modified in the template_default directory.
Nor should it be. The ozpost installer is supposed to copy this to the template-override directory and then modify it.
lat9:
I did the one-click ozPost upgrade from 3.6.2 to 3.6.5.
I'm still in the process of updating and modifying the installation/upgrade code to give better 'pre upgrade' reporting and testing, but this is quite a challenging task because the code that does the actual updating is the code written into V3.6.2, and you won't see the effect of the V3.6.5 changes until the next update comes out (and that's when I find I what I messed up with in the current release).
Anyway, est fix for your problem would be to copy the default tpl_modules_shipping_estimator.php file into the overrides folder, them make sure the server process can read and write this file, then click the buttons to uninstall and re-install the module, and all should be fine.
Cheers
RodG