ntm thanks for the reply.
There is no error message. The site does not run. There is just a blank page except for the words "Can't connect to database." I fixed it by examining which files had been modified by the plugin and replacing the one that had been trashed.
The trashed file (fields_map.parsed_types.php) is a file that is used by the database abstraction (I'm running on SQL Server, not mysql). The section that was trashed is to do with stats.
Update: Podpress plugin seems to be behaving but I have decided not to activate the stats.
Maybe just a heads up to other WP on SQL Server users.