New Wordpress media uploader tool, featured images, and plugin interactions
The new Wordpress media uploader tool introduced in 3.5 causes problems with a few plugins, including a fairly massive one I developed.
The problem manifests like this:
Disabling Plugin X fixes the problem.
My problem is that, while I know that Plugin X causes the problem, no errors are thrown in PHP or JavaScript, so I don't know where the issue is arising to fix the plugin.
I read elsewhere (ref lost) that it is caused by a conflict with plugins that use JQuery ... but the comment did not say specifically which JQuery actions conflict with the featured image.
I do notice that the Wordpress Ajax URL returns an empty JSON object when my plugin is enabled. When I disable the plugin, a JSON object with properties of the uploaded image is returned.
Any ideas?
The problem was in the plugin listening for Ajax calls in the wp-admin area, and interfering with the Ajax calls being made by the featured image tool. Preventing the plugin for listening for Ajax calls in the wp-admin area solved the problem.
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