Default access is denied to entry webform

Yes, entrywizard does require you to be logged-in to upload or judge.

You don’t need a membership plugin to log in. The login url is
your-website-url/wp-login.php

— if you want to use entrywizard you should set up your theme to show a link to this.

That is an interesting approach. It takes the user to the WordPress login. From there I am not able to view the entry form or the rating form. If I log out of WordPress and log in to the site using a membership plugin (e.g. Simple Membership) with the same username and password that I would use to access WordPress as the admin, I cannot access the entry or rating forms (i.e. logged into the site, not WordPress). I can only gain access to the entry window if I login site using another non-Admin username and password. Is this as expected? Does anyone who has admin roles using the site to upload photos for a competition need to access the site using a username and password (and associated email) different from what they use for admin access in WordPress?

I am not sure what you are trying to do.
The EWZ forms (on a page via a shortcut definition) only open up when logged in as a WordPress user. If you log in to WP as admin, then the EWZ form will open on your page and you can make entries as yourself (if that’s appropriate). For anyone else, then as the admin of your site, you need to add then as a user via your WP dashboard, and make sure they have an appropriate WP role. That role can be the lowest grade of ‘subscriber’.
Once the user has logged in, they are on the site probably at their dashboard and they would need to know how to view the site itself and the page with the EWZ form. I agree that will be a training issue, and I use a plugin called Peter’s Login Redirect to cause all logins with that level of user to go straight to my entries page. To make that even easier, I put the logon link on my entries page alongside some user instructions. So the user comes to the entries page not logged on, clicks the link, is taken to the WP logon, logs on, and is immediately returned to the entries page they just left.

Thanks Josie Stauffer and mbsharp for your input. The problem has been eliminated by converting to https:// and cleaning things up, removing all caching, and making sure that the login password for a membership plugin exactly matches that for WP site dashboard access for admin accounts.