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When a plugin or theme isn’t working as expected, it’s good to know how to troubleshoot the issue and solve it on your own or provide helpful information to anyone trying to help you.
You should first make sure you’re running the latest version of your installed plugins, themes, and WordPress.
If that doesn’t help, run through the list of tips for troubleshooting plugins in the Codex.
Next, you can try to identify which plugin is causing the problem by following these steps:
When the issue reappears, that usually indicates there’s a conflict with the last plugin activated.
Here’s a handy flowchart that shows the steps you can take to help identify an issue:
Source: http://scribu.net/wordpress/wordpress-plugin-troubleshooting-flowchart.html