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Will this plugin invalidate my cookies if I logged in before the plugin was activated?

No. This plugin will only invalidate cookies that were created after activating the plugin.

Will this plugin work with non-standard auth cookies?

Most likely, no. This plugin is only meant to be used with the standard auth cookies that WordPress uses.

Known conflicts with other plugins

This plugin overrides the core wp_validate_auth_cookie function. This means that you can't enable this plugin and another that also overrides the same function.

This is a non-comprehensive list of other plugins that also override this function (and should not be used at the same time as this plugin):

• Safer Cookies
• Admin SSL
• WordPress 2.6+ and bbPress 0.9 cookie integration
• No Login
• Disclose-Secret
• PhotoQ Photoblog Plugin

It's also possible that if another plugin is overriding a related function (e.g. wp_generate_auth_cookie) that this plugin will not work correctly.

How can I know if this plugin is properly overriding the 'wp_validate_auth_cookie' function?

Once activated, if this plugin is NOT overriding the function, then a message will be shown to admin users towards the top of every admin page.

What if I can't log in after activating this plugin?

Simply rename or delete the plugin so WordPress can't find it. This step requires that you have access to the filesystem where WordPress is installed (via FTP, SFTP, etc).

There's a small chance that this might happen. It most likely happens because of an incompatibility with another plugin that also overrides one of the core auth_cookie functions.