Everything's working fine now.
I think this was all a consequence of having previously navigated in Google Earth with the control+scroll. Doing that again here seems to have reset whatever needed resetting. There were things about it (like it working in the index, but not within the thread) that were weird, but I have no need to fathom the unfathomable. Just relieved it works.
Hopefully this experience might help someone else someday.
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