The Salesforce technology team were able to roll back to "Summer '18 Patch 11.11" to resolve the issue. We apologize for any inconvenience this may have caused.
Posted 8 days ago. Jul 12, 2018 - 16:24 MDT
Our Enterprise team was able to create a temporary fix that allows impacted users to "post" on cases. Salesforce is still working on a permanent solution on their end. We will continue to monitor the situation.
Posted 9 days ago. Jul 12, 2018 - 14:05 MDT
Customers with administrative access to Service Cloud are unable to perform the "post" action to cases. When attempting to do so, users receive a permission error. We are aware of the issue and are working with our partners to resolve it as soon as possible. We apologize for the inconvenience.