Readers finding this post: originally I thought the VST host program SaviHost may have been being picky about Helix Native.
Somewhere in all my actions the problem was resolved, so read through and glean what you can.
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WIndows 10 64 bit, using VST3 version. Worked since last April, suddenly broke.
I can load other VST3s in SaviHost and they work.
I updated HN to