Too Many Redirects / Canonical Problem?

One of my sites, https://cgblog.org went live yesterday after a massive re-build from the ground up. The site was working fine all through the night, but now access to one area of the site in particular (Community/Forums from our menu bar, run using the Simple:Press Forums plugin) is generating a Too Many Redirects error, and won’t come up. Some of my readers are telling me they can get to it, however, so it seems inconsistent.

A couple things to note:

1. We used to have the site at https://www.cgblog.org, but for efficiency I’ve opted to drop the www. on the new site, and have .htaccess configured to redirect accordingly:

RewriteEngine On
RewriteBase /
RewriteCond %{HTTP_HOST} ^www.cgblog.org$ [NC]
RewriteRule ^(.*)$ https://cgblog.org/$1 [R=301]

2. We also used to use long-form URLs for all of our blog posts. The form of /year/month/date/post-title/. Again for efficiency, we’ve opted to now use just the WordPress page ID going forward. All of the old posts are still in the database, so we have years worth of people linking to the old URLs.

Is this something I’m doing wrong with our site, or is this a problem with WP’s handling of canonical URLs? I haven’t a clue what the problem is let alone how to fix, so I’d greatly prefer any help. A core part of our blog is down in the mean time as long as folks keep getting this pesky redirect error.