Comments Plus Avatar Issue

We've got the comments plus plugin implemented and working properly. The problem we're having, is calling avatars of users who have commented with Facebook in other locations.

While the avatars show up, it seems they can't be resized using the get_avatar function. We're trying to use it in a "recent comments" type feature around the site.

Specifically get_avatar( $comment, 48 ) returns the Facebook icons at their default 40px by 40px

Any insight would be much appreciated!