Username Change

Due to staff changes, I had to change a Username and email addy. Content type owner acknowledged the change by showing the the new owner username. BUT... for some reason, the content itself has not recognized the new username. I had to actually go into the content as admin, update the and save in order for the new user to view it.
I thought that a simple cache clear would do the trick, but it didn't... Any help and direction is appreciated.