"The lock on a folder means that the folder is shared from another Workspace. Since these items belong to another Workspace you are not able to edit these assets. You will need to Clone them, then edit the clones.
I've never seen this... did you go into the roles and make sure that under the admin role all of the 25 (or so) sub-abilities were checked? Maybe put in a ticket to support?
"The lock on a folder means that the folder is shared from another Workspace. Since these items belong to another Workspace you are not able to edit these assets. You will need to Clone them, then edit the clones.