[Plugin: WP Super Cache] RSS Issues After Turning on Preload

Hello,
I’ve spent the last couple evening tweaking the WP Super Cache settings on my site to speed things up. I’ve been really impressed with the site speed, but unfortunately my RSS feed doesn’t seem to be working as it did before. I noticed this because I have an RSS driven email campaign (using Mailchimp if that matters) and since tweaking the Advanced, and Preload settings, my emails have ceased.

The feed still validates, so I’m somewhat at a loss of where to go from here. Thanks in advance for your help!