CDRWin screw it
Thanks for helping!
Padus did the job.
The first session was done with CDRWin 4.0a (Plextor 24-10-40A). I use it since at least 2 years for burning all my bin-cues. Never had trouble. However, I wanted to try a multi-session one now. I did it, all seemed ok.After few days, when adding the second session, all got screwed, despite CDRWin showing it successfully imported the first session.
In fact I did a third session with Padus 4.0.1002, but being unsure how to, I screwed it again, so I had 3 sessions, only the third and second(also CDRWin) being visible.
I did then the fourth one with Padus, now successfully including all the previous three, so, all is ok now.