justinwi, i have registered here to say ‘thank you’ and write about problem and solution based on your post! And it’s will be good help for guys w/ the same problem.
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I had a problem w/ Multiple Themes plugin w/ custom self-written theme. So i want to add additional theme only for only my /blog webpage and found this good solution from jonradio.
But after adding theme and applying plugin whole website was looping & i had error on page. Only adminpanel was accessible.
And after 2 days I traced all wp code & found problems w/ this loop.
Plugin successfully detected main theme but wordpress somehow didn’t.
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So thing i’ve done – just added code below to index.php file:
define(‘WP_DEFAULT_THEME’, ‘default_theme_name’);
And this annoying loop have gone away!
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Maybe my success story will help someone ¯\_(ツ)_/¯
