I have had quite a few problems trying to make 1:1 copies of SecuROM New protected CDs...
The thing is (It's explained somewhere here on Gamecopyworld) Alcohol (or any other program that can handle Securom NEW) must make a kind of physical layout map of the CD, and while it's doing it any other program running can potentially screw up the whole process...
So first I would advise that when you use Alcohol 120% in Securom NEW mode to extract the image close all others applications, and after the image is made, mount it on the virtual CD player from Alcohol with the RMPS (Recordable Media Physical Signature) emulation option ON...
Last time I had to deal with Securom it took me 3 tries to extract a good image, so don't despair
Hope I helped