Currently running version 18.104.22.168 on a couple sites running WP 3.2.1, and a couple sites still using 22.214.171.124 or 126.96.36.199.
This duplicate key error has been an issue since way back in the earliest versions of podpress we've been using on these sites since 2005-2006.
Example from the error logs:
INSERT INTO wp_podpress_statcounts (postID, media, feed) VALUES (22687, 'Showfile.mp3', 1) ON DUPLICATE KEY UPDATE feed = feed+1, total = total+1;
I read older posts in these support forums that said the problem had been resolved with updated versions, but I keep seeing the error no matter how up-to-date we've kept podpress.
Is there a solution yet?