Had the same problem when I first "Switched over".
Turns out DB2 dosen't set 3D mode to any key, "W", When you first use it.
So you would have had to set it yourself, Before you started.
There is no way to recover your work, as I know of.
So you will have to start over. =[
Though to be honest, unless you're making a Srb2CB Map, there is no real reason to need DB2.
Maybe that's just me.