problems with latest CVS IMP

[Michael Geier, CDM Systems Admin]

Was running IMP 3.0RC1 for awhile just fine.

Installed RC2 (and HORDE RC2) and now receive the following error when
attempting login to IMP, after completing HORDE login:

IMP Maintenance Operations - Confirmation

Warning! IMP is ready to perform the maintenance operations checked below.
Check the box for any operation(s) you want to perform at this time.

A fatal error has occurred
object(db_error)(10) {
  ["error_message_prefix"]=>
  string(0) ""
  ["error_prepend"]=>
  string(0) ""
  ["error_append"]=>
  string(0) ""
  ["mode"]=>
  int(1)
  ["level"]=>
  int(1024)
  ["code"]=>
  int(-19)
  ["message"]=>
  string(23) "DB Error: no such field"
  ["debuginfo"]=>
  string(0) ""
  ["userinfo"]=>
  string(469) "update horde_users set pref_value =
'a:1:{i:0;a:9:{s:2:\"id\";s:16:\"Default
Identity\";s:8:\"fullname\";s:0:\"\";s:9:\"from_addr\";s:0:\"\";s:12:\"reply
to_addr\";s:0:\"\";s:9:\"signature\";s:0:\"\";s:9:\"sig_first\";i:0;s:10:\"s
ig_dashes\";i:0;s:14:\"save_sent-mail\";N;s:16:\"sent_mail_folder\";s:9:\"se
nt-mail\";}}' where pref_uid = '[ snip user ]' and pref_name = 'identities'
and pref_scope = 'horde' [nativecode=Unknown column 'pref_uid' in 'where
clause']"
  ["callback"]=>
  NULL
}
[/usr/local/apache/htdocs/webmail/horde/lib/Prefs/sql.php : 273]

Did the database change format?  I couldn't find the normal sql files under
imp/scripts/db.
Any help appreciated.

.mike