I am unable to save any changes to the theme via the admin interface.
Please advise.
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Hi,
We think your error is related to your server Apache. I found an article I think useful for you.
Please read this:
+ https://www.eukhost.com/forums/f18/403-error-form-submit-6805/
+ https://www.drupal.org/node/110219
Hope it's useful for you.