[Theme: Graphene] RSS feed broken

Hi, the RSS feed appears to be broken with WordPress 3.3.1 and Graphene 1.6. When I try to load my RSS page, I get the following message:

This page contains the following errors:

error on line 12 at column 52: Entity ‘raquo’ not defined
Below is a rendering of the page up to the first error.

Others appear to be having this issue too. https://www.ads-software.com/support/topic/raquo-error-in-rss-feed

https://www.ads-software.com/extend/themes/graphene/