We recently upgraded our test Environments from SQL Server 2012 to SQL Server 2016 (SP1). After the upgrade we get en error whenever we try editing Maintenance Plans. I can open Maintenance Plans from Management Studio (13.0.16106.4) but non of the tasks are editable. Renaming a maintenance plan from the GUI gives me the error "Login failed for user 'sa' (Microsoft.SqlServer.IntegrationServices.ObjectExplorerExtensions)". Deleting a plan and recreating it works, and renaming a plan I created after the upgrade works fine. Also, in the GUI, when I open a task, I can change properties in the properties window, but I can't edit the task from the popup window. The OK button is disabled.
Did anyone else experience the same thing (and yes I know, Maintenance plans are..... But now we have them...)