Ok...do you know what? I switched to using Studio because I had trouble with the old TagEditor, not only because of wrong segmenting the file, but also because many tags disappeared and formatting in the output file was completely disrupted. I realize that pre-segmentation was missing in my own workflow.
In any case, I'm pasting a screen shot of the editor view in Studio for you to have a comparative point of view. I guess they look somewhat similar. The upside of using Studio is that it seems that there's no need for any pre-segmentation as the application does that automatically when preparing the files for processing.