hmm - yeah, this is cunning. So basically what's happening is that if the field is _blank_ then the template spots this, and fills in a reasonable default for you. This is typically a picture from the dictionary, or it could be a prompt field, or a comment field (also taken from the dictionary) and so on.
the way to override this behaviour when you explicitly want it to be blank, is to put an empty string there. In other words, set the picture to
''
That way the template doesn't see it as "blank" - but you also don't restrict the length of the field you want to display.
Another cunning tip is to put say the first 250 chars in the column, but put all the text into the Field Tooltip. that way the user sees a short text, but if they mouse-over it, they see a long one. This isn't so cool on touch devices (where there is no mouse hover). another approach is to have the big text, but put it on a line by itself (like in example 50) and then make the browse row contract and expand. (I think you've thought of this too)
cheers
Bruce