Over half of my SM devices (90+) now have a dash mark where the username used to be.
I've tried all I can, but this is a real issue because my computer names are all generic IDs. It's very difficult to determine whose device is whose. The answer from Support was that the fix was to compile the most recent SM update into our account. That was done and the agent was re-checked in and the computer restarted. Even after waiting a day the user/username fields are still blank.
I do have an owner listed for a few devices, but not all and since that information is static, it's essential susceptible to change and is basically only a note.