Error when deleting containers and forums

I receive the following error when deleting containers and forums:

user error: Table 'db12345678.forum' doesn't exist
query: SELECT f.nid FROM forum f WHERE f.tid = 37 in /.../includes/database.mysql.inc on line 66.
user error: Table 'db12345678.forum' doesn't exist
query: SELECT f.nid FROM forum f WHERE f.tid = 38 in /.../includes/database.mysql.inc on line 66.
warning: Cannot modify header information - headers already sent by (output started at /.../includes/common.inc:384) in /.../includes/common.inc on line 192.

I am running the latest CVS versions of Drupal and all modules including forum module. My config is using a database prefix so I believe the code is not appending the db prefix.