Sorry to hear that the upgrade did not go well for you.
It appears from the description and screenshot that the wpmembers_fields option either was emptied or deleted. However, for an upgrade, I can’t really see a scenario in which that could happen. The upgrade process doesn’t do anything with that particular setting.
I would look in the wp_options table for the wpmembers_fields (which is the option_name). See if it does not exist or was inadvertently renamed, or if it is there but empty.
If you maintain database backups, you could revert to a backup. You would not need to restore the entire database, just the wp_options. Or, you could potentially copy the fields setting (option_name wpmembers_fields).
You can force an installation of default settings by editing the wp-members-install.php file. At the beginning of that file there is a variable setting that can be changed in the event a forced install is required. This will revert settings to the default settings, but it will force an install of the fields setting. Deactivate the plugin, set $chk_force = true where indicated in the file, then reactivate the plugin to force the install. Be sure to change back to $chk_force = false when complete.
