Interesting. I changed my username in the client but was unable to change it online, so someone who sees me on the client (say, if I were to do a chat) won't be able to find me in the forum. I actually wanted to change to the client alias on the editor and in the forum, but that function was disabled shortly after I joined.
Again, this disconnect is why we need an alternate means of contacting each other, either embedded in the editor or in the client.
At the very least, the name that appears in WME needs to have a corresponding account in the forum, or there's no communication AT ALL.