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This has been known to happen if you have another plugin of an infection which is designed to prevent you from using the POST method on forms, or when such an attempt to filter the POST variable on a form results in an unexpected error from the interfering code.
Your best course of action is to check the error_log files on your server right away to see what code in what file is causing this error. You can also try temporarily disabling all other plugins to see if that allows you to POST the form data, then re-activate each plugin one at a time (trying to POST the form data after each one) until you find the one that is responsible for this error. Keep in mind though, if this error is being caused by a malicious injection then it could be in the theme, or the core files, and not just in the plugin files.
If you want to send me the relevant errors you find in the error_log file then I can help you figure out how to fix this.
