I am experiencing the same issue with truncation as indicated in this thread:
I opened up a support ticket with StudioPress, but my helper didn't seem to think it was a Genesis issue. So I'm coming back to you. :)
I *did* notice an odd behavior related to inputting text in the "Introduction Content" area... If there's content there, the truncated shortcode [post_terms taxonomy= prints as text to my actual archive page. If there's no content, this does not print.