Well, they knocked it back to 5.4 and now it's working. Told me I have a couple of months to upgrade. Not sure I will or won't at this point, with them, anyhow. Thinking it may be time to move to another host that I don't have to threaten to get anything done.
One issue remains. I tried to set up a new ZC v1.5.7d in a different folder, using their module. It didn't work. Got error messages. Wondering if it's because ZC was looking for older version and went wiggy or something in HostGator's php mod. Will check and post results. Thanks to everybody for all the help and suggestions.
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