According to the OP, he went through hell and back to discover the problem could be overcome by running AHK with admin privileges… IMO that is a somewhat obscure solution. So I imagine he explored all the usual suspects.
If the OP zipped up the Preferences directory, deleted it and then started Sigil (as they do normally) they'd have a fresh default set of preferences without changing anything else. If the problem disappeared - then its something in the existing preferences.
BR
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