I have the same error today trying to update a podcast
The feed is
http://podcast.oneplace.com/Grace_to_You/3011135.xml
I successfully added it using MM RC2 (1105) on 26 Nov and downloaded the 6 available podcasts. On 28 Nov, it gave me the error "There was a problem querying the database: Error executing SQL "Select PodcastEpisodes. * from PodcastEpisodes where PubDate = 39413.000000000 AND title = 'The Character of God's Word' AND idPodcast = 1" : near "s": syntax error (1,1).
I have to close and open MM3 to try update a second time, assuming MM3 doesn't allow repeated PodCast updates within the same session.
The other podcast I subscribed to works fine.
I've install RC3 (1109) and get the same results.
I also uninstalled, deleted the database and settings, reinstalled MM3 and got the same error.
I subscribed to the same podcast using iTunes and it downloaded the latest available podcasts. (I really don't like iTunes but to verify the feed).
DebugView results to be emailed to support.
MM is a fantastic app and v3 is really great. Keep up the good work.
Capt. Bob