One problem I can't seem to solve is that all images in my posts are left-aligned, even when I specifically select the align-center option in the WordPress add media pop-up.
You can see an example of what I'm talking about here: http://www.hive101.com
The posts that DO contain centered images are only like that because I edited the HTML of the post and manually put in < center > and < /center > tags.
I found this post: http://wordpress.org/support/topic/164999
But the code in there doesn't seem to affect Tropicala.