You're welcome, and I agree, it should at least warn you if it comes up short of RAM.
In researching a bit for my answer above, I set out to try the filter on a number of images, some of which should have been "no brainers" for the filter to process, and I have to say, for me it did what it did for you on a couple of occasions. It seems to have trouble with the transition between sharp areas and their edges that border on quite smooth backgrounds.
I hope Adobe continues to refine the operation of this filter.
-Noel