I have authored a couple of previous postings regarding Xtol failures. I now mix at higher temperatures and let the mixed solution 'rest' for a while ensuring that the powders are completely dissolved. I have not had any failures for months. I am a little dissapointed that the 1 litre packs are being discontinued, but that will not stop me from using it. I think it is the best developer available other than PMK which is a little more trouble to use.(posted 8279 days ago)