Update 9pm 5/23: Problem with Salesforce Summer 16 patch 5 released on 5/17.
Salesforce released a patch to the Summer 16 release last night - and installed it automatically in all sandbox instances that are on Summer 16. The patch breaks customer's ability to use custom components and custom themes.
The patch was supposed to include a "fix" to this Known Issue: https://success.salesforce.com/issues_view?id=a1p300000001ACTAA2 but we believe they have made the issue worse instead.
Some Key notes:
1. This issue is not related to Rockaway. It impacts earlier releases including Banzai.
2. This issue only affects selected sandbox instances (that are on Summer 16). We have no reports of this impacting any production.We will keep you up to date as we know more about this situation.