Thank you for quick response. Full warning text is as follows:
Warning: Cannot modify header information - headers already sent by (output started at /data01/virt71886/domeenid/domain.com/wp-content/plugins/stops-core-theme-and-plugin-updates/templates/notices/thanks-for-using-main-dash.php:2) in /data01/virt71886/domeenid/domain.com/wp-includes/option.php on line 919
Warning: Cannot modify header information - headers already sent by (output started at /data01/virt71886/domeenid/domain.com/wp-content/plugins/stops-core-theme-and-plugin-updates/templates/notices/thanks-for-using-main-dash.php:2) in /data01/virt71886/domeenid/domain.com/wp-includes/option.php on line 920
I confirm that I didn’t get it after I dismissed the welcome notice.