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Another detail that would be helpful is a description of how you treat the PC and jars while cooling. . .and what kind of lids/verm seal/filter disks you may be using. When all jars fail in a batch, it tends to be incomplete sterilization, but what you describe sounds like a mold. Many times they are introduced during the cooling or innoculation stage. Not always, but some more information would help. When you are having problems like this, be sure to include a jar that you do not innoculate with the others. Incubate it as normal. If all jars including that one fail, it really points the finger at sterilization/cooling.