I have upgraded my FreePBX 2.5.x to FreePBX 2.6.0.1.
With the old version it was accepted in the “Display Name” of Extensions, by example, “M. John”, but with de new version it tells me that it’s wrong “Please enter a valid Display Name”.
No, it was changed in 2.6, only alphanumeric characters are allowed. I think that this question was asked a while ago and I looked it up why it was changed, but I have forgot what it was.