Google Checkout Integration Error

Since upgrading from version 3.4.5 to 3.4.6, which according to the upgrade documentation also requires upgrading the Google API to version 2.5, the Google Checkout Integration Console has been reporting errors. On my production installation, I see the following errors:

Error: We encountered an error processing your notification acknowledgment. The error we got is: Expected serial number was not contained in notification acknowledgment.
XML we received: <?xml version="1.0" encoding="UTF-8"?><notification-acknowledgment xmlns="http://checkout.google.com/schema/2" />

Using the demo site: http://drupal.demo.civicrm.org/, I configured the sandbox, which results in the Integration console showing the following errors:

Error: We encountered an error processing your notification acknowledgment. The error we got is: Error parsing notification acknowledgment.
XML we received: <p>Initialization Error</p><p><pre>Array
(
[callback] => Array
(
[0] => CRM_Core_Error
[1] => simpleHandler
)

[code] => -27
[message] => DB Error: no such database
[mode] => 16
[debug_info] => [nativecode=1049 ** Unknown database 'civicrm_arms']
[type] => DB_Error
[user_info] => [nativecode=1049 ** Unknown database 'civicrm_arms']
[to_string] => [db_error: message="DB Error: no such database" code=-27 mode=callback callback=CRM_Core_Error::simpleHandler prefix="" info=" [nativecode=1049 ** Unknown database 'civicrm_arms']"]
)
</pre></p><p></p><p>backTrace</p><p><pre>/var/www/drupal.civicrm.org/svn/civicrm34/CRM/Core/Error.php, backtrace, 235
, simpleHandler,
/var/www/drupal.civicrm.org/svn/civicrm34/packages/PEAR.php, call_user_func, 931
/var/www/drupal.civicrm.org/svn/civicrm34/packages/DB.php, PEAR_Error, 968
/var/www/drupal.civicrm.org/svn/civicrm34/packages/PEAR.php, DB_Error, 564
/var/www/drupal.civicrm.org/svn/civicrm34/packages/DB/common.php, raiseError, 1903
/var/www/drupal.civicrm.org/svn/civicrm34/packages/DB/mysql.php, raiseError, 898
/var/www/drupal.civicrm.org/svn/civicrm34/packages/DB/mysql.php, mysqlRaiseError, 262
/var/www/drupal.civicrm.org/svn/civicrm34/packages/DB.php, connect, 558
/var/www/drupal.civicrm.org/svn/civicrm34/packages/DB/DataObject.php, connect, 2291
/var/www/drupal.civicrm.org/svn/civicrm34/packages/DB/DataObject.php, _connect, 2529
/var/www/drupal.civicrm.org/svn/civicrm34/packages/DB/DataObject.php, _build_condition, 411
/var/www/drupal.civicrm.org/svn/civicrm34/CRM/Core/BAO/Setting.php, find, 209
/var/www/drupal.civicrm.org/svn/civicrm34/CRM/Core/Config.php, retrieve, 397
/var/www/drupal.civicrm.org/svn/civicrm34/CRM/Core/Config.php, _initVariables, 202
/var/www/drupal.civicrm.org/svn/civicrm34/extern/googleNotify.php, singleton, 42</pre></p><p></p>