Okay, now that you mention Argent, I remember which one it was. I read the preview of the first issue. They were in a spaceship about to crash, either that, or they're chased by something. I haven't read anything beyond that.
I remember Argent because she's hot and not so subtly crushing after Nightwing, though I don't know if that one is in this series or the next.
Anyway, the not selling well part is the actual problem, as it seems both DC and the fans have defined any Titans franchise by the existence of either the Fab Five or NTT crew