Output Buffer Tester
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This plugin helps to developers to find which plugin or theme closed their opened full page output buffers.
Output Buffer Tester is for debugging purpose only. Please deactivate and remove if you do not need it anymore!
Usage
Install and activate the plugin. Append ?ob-test=1 to any url on your page and see the result. If everything goes well, you are fine. If there is an error, you will see an error message and a call stack, so you will be able to find out who closed the output buffer.
This plugin is available for download for your site.