If a teacher had a Kidblog account prior to joining your organization, there is a two-step process to fully connecting to the class.
It is likely this teacher's class is not yet connected to the organization. Any classes that were present under the teacher's account prior to joining your organization will need to be connected to your organization.
To merge these classes into the org, the teacher should log in and visit the connect link, found at the bottom of your org Classes page (https://kidblog.org/org/__ORG_ALIAS__/connect).
Once connected to your organization (teacher account and pre-existing classes), post/comment capabilities will be restored. If you continue to experience issues, please let us know by emailing us at email@example.com.