"Custom Signup" Popup Appears on Live Site Only (Includes Workaround)

We're aware of the issue and are currently gathering more information regarding this matter.

Meanwhile, please use following workaround:

1. If Member Signup tab is missing, set a page permission to Members Only (so the member signup tab will be available).

2. Go to Member Signup Tab and Delete Custom Form.

3. Save and Publish the Site.

This article is credited to the Wix team - https://support.wix.com/ and we thank them for that!