I have been running version 2.9 using the PG4WP plugin to run a PostgreSQL database. I never upgraded my wordpress to the latest version as this plugin was only for versions up to 2.9. I noticed that this plugin is now compatible with 3.2.1 and so updated to the latest version of wordpress. After an error issue I updated to the latest version of the plugin and can now view my blog fine.
The problem is that when I login I get the "Database Update Required" message. As my database is not MySQL, I don't know what running the database update will do. I can't find an answer to this on the Net. Could anyone using PostgreSQL, who has done an update, let me know the correct proceedure?