We use Everclear for a lot of things in coating and making and therefore it should not be the source of the problem. Having denatured alcohols may cause this kind of thing depending on denaturant, and that is why I warned against them, but Everclear has been shown to be safe at rather high levels AAMOF. Did you try a PET scan?

Seriously, I have no idea. I have never had that problem, but I always add it right after making or preparing gelatin or Silver Halide, and I believe that I have always added it at 40 deg C.