I won't pretend to understand the mechanics of any of this, but I'd like to learn what makes this tick.
As Joshua points out, the url sans-cPath puts the product info page back into pre-master-category-change mode. And when the cPath is included in the url, the catalog behaves as it should, recognizing the current and correct master category.
And none of this changes the fact that the problem exists when SEO URLs is enabled, and goes away when SEO URLs is disabled. Somehow, the two appear to be connected.
Or is there some other factor that could create the illusion of causality?




