I recently updated from SugarCRM CE 5.2.0L to SugarCRM CE 6.0.0.

When I update any record, let's say a user or account record and then try to save the record, it always flags the fact that the Assigned to: field is blank. Now, I know that the assignee was already in the database because when I do searches by that field, it works and the assignee searches correctly. But when I pull up the record for edit and try to save it, it's always blank. I fill it in and the save goes correctly. I don't see anything directly related in the log, but the bottom of the log looks like this:

Thu Jul 22 12:41:42 2010 [2209][372ffb8b-0659-4f40-97f3-47befedcf0a9][DEPRECATED] Formatting correction: Emails->date_modified had formatting automatically corrected. This will be removed in the future, please upgrade your external code
Thu Jul 22 12:41:42 2010 [2209][372ffb8b-0659-4f40-97f3-47befedcf0a9][DEPRECATED] Formatting correction: Emails->date_sent had formatting automatically corrected. This will be removed in the future, please upgrade your external code
Thu Jul 22 12:41:42 2010 [2209][372ffb8b-0659-4f40-97f3-47befedcf0a9][DEPRECATED] SugarBean.php: preprocess_fields_on_save() is deprecated
Thu Jul 22 12:45:23 2010 [2213][372ffb8b-0659-4f40-97f3-47befedcf0a9][DEPRECATED] Formatting correction: Contacts->date_entered had formatting automatically corrected. This will be removed in the future, please upgrade your external code
Thu Jul 22 12:45:23 2010 [2213][372ffb8b-0659-4f40-97f3-47befedcf0a9][DEPRECATED] Formatting correction: Contacts->date_modified had formatting automatically corrected. This will be removed in the future, please upgrade your external code
Thu Jul 22 12:45:23 2010 [2213][372ffb8b-0659-4f40-97f3-47befedcf0a9][DEPRECATED] Formatting correction: Contacts->birthdate had formatting automatically corrected. This will be removed in the future, please upgrade your external code
Thu Jul 22 12:45:23 2010 [2213][372ffb8b-0659-4f40-97f3-47befedcf0a9][DEPRECATED] SugarBean.php: preprocess_fields_on_save() is deprecated

I recently upgraded from 5.2.0L to SugarCRM CE 6.0.0.
I am running on a Linux system. CentOS 5.4
I am running MySQL 5.0.77
I did the various repairs in the admin function when I made the various steps of upgrade (5.2.0 to 5.5, 5.5 to 5.5.4, 5.5.4 to 6.0.0)

Any ideas. The original upgrade 5.2.0L was a new clean install. The database already had data in it.