Kudos to you, you grand-super-DBA you. Wish I had some imaginary internet points to give you right now. Why? Well, for not only posting the details of your your problem but following through with the answer after no one responded.
This morning, one of our Systems techs sent me an EventID 11 Event Log entry identical to the one you've described. I've worked SQL Server KERBEROS issues in the past and one thing that they all have in common is that in no way, other than luck, will one find the cause and solution for one a KERBEROS issue in a single day of research.
Now, thanks to you and your OCD-tendencies, I get to pop back with an intelligent analysis and easy solution the same day the issue was raised. Total win-win for me. You rock, you rock star. Thanks!
And as to the OCD statement, it was said in a tone of complete respect. See, it takes one DBA with OCD to know one, eh? Bet you a dollar that you've done one or more of the following: pushed for standardized server names, spent hours writing SQL Server maintenance related TSQL scripts that are SQL Server version independent, campaigned to have your programmers use three part naming in their code, fought for standardized database names across all dev, test and prod instances. Any of that sound familiar? :-).