I have a basic installation with virtually no customization. Upon clicking the Next button at /subscribe-to/, I get a cleared form and a Joomla error:

"Please fill in all of the required fields."

The page URL is now /subscribe-finish/, and the form is empty. Obviously the RSMemberships validation passed, since all fields were filled.

Thank you in advance.

P.s. I was quite irritated to have to type this post twice after I failed to enter the security code. This seems unnecessary for paid members, and is at a minimum a serious hassle for the post to be lost. Please consider changing this configuration.

Update: I've attempted to eliminate the possibility of validation script conflicts by disabling the only other form on the site, an Acymailing subscription module. This had no effect.

I've also noticed that the RS Memberships validation fails when a registered user attempts to subscribe to a membership. No fields are treated as required.

Turns out I had a redirect in my .htaccess file that was appending / to all urls. Thanks to the RS staff for helping me find it.