#1 Burning Software

I'm quite new to StarBurn. I thought that it could be a real (and powerful) alternative to the much hated Nero-Bloat, but i'm having problems.

I tried to add files to my multisession BD-R, but the imported last session is empty. I remember having done that already a couple months ago with another BDR and the imported session was shown in the right pane, so i don't understand what i'm doing wrong.
HTTP://I.IMGUR.COM/4IXY0UP.PNG

But the BD-R is not empty:
HTTP://I.IMGUR.COM/NVFTL85.PNG

Please help me sort this out. If more info is needed, i'm happy to oblige.
jj

It looks like you have recorded previous session with something non-StarBurn based. ISO9660 / Joliet are fine, but we won't be able to append UDF discs created by other burning apps (so do they, there's no inter-app compatibility).