The conclusion is that crystallized honey is perfectly OK as it is, but if you really want to liquify it, do so with very gentle low heat. And the three things that make it more likely to crystallize are:
As was promised to us, the weather has warmed, the flowers are in full bloom, and the bees are prospering. These are busy times for both the bees and the keepers. Packages and nucs have been received and many of us are experiencing beekeeping for the first time. In part overwhelming, and in part a true pleasure.