Hi. Thanks for your quick response. Everything you said is true but misses the point - Speccy should have some "sanity" checking built in for these situations,...so that when a blatent impossible result comes up, it flags it for the user. Don't get me wrong, I'm sure in most cases this is a probably a very difficult thing to do...but this particular instance... reporting "-1" empty slots is simply not helpful to the user. (Maybe suspicious results could be flagged in red, or something like that...)
Anyway, I was just surprised to see that result as I consider Piriform software to be so stable and well done - it's one of the few pieces of software that I go ahead and install the latest version, as soon as it comes out, without hesitation.