Hi Jeff,
The solution I came to was, I just stopped using the plugin “WP Indeed Ultimate Member”, I found an alternative membership plugin that actually works better for my website, and it does not cause conflict with USP Pro.
The error appears for the free version and the pro version of USP. When USP and WP Indeed Ultimate Member are both active, the login button on the login page will display a back end JavaScript Error. Not sure why, but my solution was to stop using the other plugin.
