Cannot modify header information when adding points to user

Cannot modify header information when adding points to user.
I get a blank screen with the following:

Array ( [uid] => 2 [points] => 23 [time_stamp] => 2007-02-02 04:21 +0000 [approver_uid] => [event] => admin [status] => 1 [mode] => add [submit] => Save [form_token] => adc9571bf3d7d8dd7051516c63d4a453 [form_id] => userpoints_admin_txn )

The points are added, but I just get a nasty page.

When I click back on the browser:
User user1 earned 23 credits! Total now is 46 points.
warning: Cannot modify header information - headers already sent by (output started at ............\drupal-4.7.6\modules\userpoints\userpoints.module:492) in
.............\htdocs\drupal-4.7.6\includes\common.inc on line 267.

From the logs:
Location https://localhost/drupal-4.7.6/admin/userpoints/manage/add
Referrer https://localhost/drupal-4.7.6/admin/userpoints/manage/add
Message Cannot modify header information - headers already sent by (output started at ...\htdocs\drupal-4.7.6\modules\userpoints\userpoints.module:492) in
...\htdocs\drupal-4.7.6\includes\common.inc on line 267.