MANAGE permission
3.1 added a new MANAGE permission. Without this permission in the database, the Portlet Manager will not show any portlets or channels.
 This permission appears to have been added via the uportal-impl/src/main/resources/properties/db/entities/permission/Portal_AdministratorsMANAGECHAN_ID._94-.permission file in 3.1.0. However, the effects of not having this permission weren't seen until 3.1.1? Verify...
To add this permission manually, run the following sql:
INSERT INTO UP_PERMISSION (OWNER, PRINCIPAL_TYPE, PRINCIPAL_KEY, ACTIVITY, TARGET, PERMISSION_TYPE) VALUES ('UP_FRAMEWORK', '4', 'local.2', 'MANAGE', 'CHAN_ID.*', 'GRANT')
Verify that local.2 is correct (UP_GROUP where GROUP_ID=2 is "Portal Administrators")