What is that file you are editing. it doesnt look like any core file. Also its hard to tell but it looks like all the problems are with a component called and not with something from the core like com_content

It's problem on file: /libraries/cms/application/site.php

This may be the same issue: #12499

Basically after updating Joomla, all component routers are being loaded. Many of the routers in extensions were/are badly written (have code outside of the functions) and cause default style to be loaded. This happens because of some Joomla methods get called before they have been properly initialized.

@mahagr You right, but in joomla 4.6.2 all works well....

The issue appears once you update Joomla to 3.6.3 or later.

@mahagr

do you mean that some component routers are modifying the value of 'Itemid' just because they get loaded?

@ggppdk Most broken components I've seen have includes in the router file which end up running some code -- usually initializing some variables or loading some javascript files for the component. The reason why those break template assignments is that they (eventually) end up calling $app->getTemplate() before Joomla has decided which template style it should be using.

Basically this causes the above call to always select default template style. See the link in the issue description, that's where it happens.

Also please read the long discussion inside issue #12499.

I have the same issue, using a redirect on login to 'members' area with a different menu in the template but the default template is loaded with SEO on. When I turn off core SEO settings its all works fine and loads and displays the correct templates. Using latest Joomla and T3 Framework template.

@leetempest To fix the issue, see #12499.

mahagr,
Thanks for the reply, Unfortunately I'm not a PHP developer :-(. I'm struggling to find the fix mentioned in the post you linked too. Is this related to the T3 Framework plugin / template or Joomla code?

Is this related to the T3 Framework plugin / template

Almost certainly

On 10 November 2016 at 15:46, Lee Tempest notifications@github.com wrote:

mahagr,
Thanks for the reply, Unfortunately I'm not a PHP developer :-(. I'm
struggling to find the fix mentioned in the post you linked too. Is this
related to the T3 Framework plugin / template or Joomla code?

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If T3 worked before and not after Joomla update, I would say that its not to blame -- otherwise it would have been broken before. I would make a copy of the site and remove 3rd party components one by one until the assignments work again. Right now there's no other way as there's a bug in the new logic that causes this (there's already fix, its just not released) which basically makes it not possible to just disable components to see which one caused it.

You can't say that. From repeated experience t3 has broken with almost every minor release.

I am experience the exactly the same problem with a standard joomla installation. What is the solution? Is there somebody who is trying to fix it?

There are many possible causes on why template styles aren't working. Please read my comments and follow the links in them. The issue is always either a badly written plugin or badly written component router.

I am closing this as a non core issue. Keeping this open isnt going to help as there is nothing that can be done in the core