jimmy,
first and foremost, your thread title is incorrect, as there is no possible way, that upgrading dolphin can break the cron job. the cron job is run by the crondaemon on the server, and there is nothing, and i mean nothing on dolphin that could affect the cron job settings or the daemon.
so with that said, lets look at your situation:
cron is working, and that is clearly evident in the fact that you are getting notices that your database servers is failing, so partly to blame is that you have an issue with your database, which would fall hand-in-hand in you thinking your cron jobs are not working, since the cron jobs are fired from the database, which is invoked from the periodic/cron.php file on dolphin.
so if your database is failing, then the cron jobs will follow suit, since they cannot fire because they are not being triggered. Database access error, this would need to be looked into,
you can enable full debug mode on your mysql /inc/class/BxDolDb.php
on or about line 26:
efine('BX_DOL_TABLE_PROFILES', '`Profiles`');
define( 'DB_FULL_VISUAL_PROCESSING', true );
define( 'DB_FULL_DEBUG_MODE', false );
define( 'DB_DO_EMAIL_ERROR_REPORT', true );
set:
define (DB_FULL_DEBUG_MODE',true);
then check your site,
the report could be getting sent erroneously, and that would mean that you need to have your hosting company looking into this. but i think your database is dropping off, and though you may not see it, the script is seeing it fall off.
could be wrong here, but certainly open to other suggestions on this one.
When a GIG is not enough --> Terabyte Dolphin Technical Support - Server Management and Support