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It is usually because there are spaces, new lines, or other stuff before an opening tag, typically in wp-config.php. This could be true about some other file too, so please check the error message, as it will list the specific file name where the error occurred. Other Resources: PHP: Headers Already Sent
Monster Widget is a bit of a trap like that. Despite how it looks it doesn't actually place "real" widgets into sidebar. It is a single widgets that creates output of other widgets inside of itself. If you are significantly interfering with its expectations then it won't pick up on changes, since it's not engineered to do it. You will likely need to use ...
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