I've run into a bit of a problem. I'm feeding the dispatch component a tree of patterns, so i was expecting a tree of lists out of it... but this doesn't seem to be the case.
Try connecting the a output from the vb.net component directly, bypass the simplify tree component.
It's just a guess, but I think it's because the divide component returns {x;x} paths, so the boolean paths should be at least {x;x;x} in size, but the simplify tree returns {x} paths.