Hi Mark,
When you create a new investment, the Income tab on the Investment Properties dialog defaults to "No Income". As it is I'll second guess if the investment truly pays no Income or if it just was never categorized. A thought for what it's worth...if it there was a fourth category-"uncategorized"-that it defaulted to, than we can classify with certainty investments that don't have a history of paying any interest/dividends as "No Income." I've been entering "No dividend/interest History" in the description field to indicate that it's been reviewed and the investment is properly classified.
Michael