I only use Xtol as a stock solution, and have experienced numerous failures. As I can recall, failures occurred with TMX, TMY, Agfapan 100, and Kodak HIE. I have had possibly five failures out of three- hundred rolls of films of various types. one failure I attribute to a change in my agitation. I experimented with a 5 second agitation at 1 minute intervals (instead of 30 seconds) and concluded agitation and disruption of the development layer is critical. it is good to know that Kodak is listening.(posted 8418 days ago)