I just created my account on stackapps.
When I tried to copy my profile from my associated accounts, it blew up ("something bad happened").
So I tried to fill in the information manually, and I discovered that there is a 3-character minimum on display name (which is, I assume, the reason the copy failed).
I've had my SO/MSO/SF/SU display name as TM for a very long time...
Is this 3-char limit only for stackapps, or am I just grandfathered in on the other sites?
If I change my display name one day on SO/MSO/SF/SU, will I be unable to go back?