I've been logging in with the name that i want, but it always then says "logged in as "old account name"
That was my case for over a month, since the mid-March phase of the Beta, and it really p*ssed me.
The old Impulse Account name was my dad's nick. With his permission (of course, since he pays), I changed it to my Stardock forums nick. That part was easy, but for over a month, even though I had successfully logged in with the new Impulse name (my Sorceresss nick), once I was in, I was told that I had logged in with the old Account name (my dad's nick) --- an obvious contradiction, as you illustrate.
I complained and bitched about it on a few threads, and lo and behold, on Friday the 24th, my dad's nick had disappeared from all DG related info, and I was at last recognized as Sorceresss in the lobby and within the games.
I then believed that a technical fix had solved the issue for everyone. Maybe kryo got tired of my forum whining & bitching, and he pressured his mysterious "database guys" to fix my case to shut me up.
Sorry if I misled you all (in my reply #4) : I really believed that the problem had been eradicated on the 24th.