Just solved it.
A clean install of 10.2 worked, so I compared installed packages from my "current" machines and found that aspell_en was still only at 0.51 when 10.2 uses 6.0.0.
Upgraded to the latest aspell_en from "L" and now I can enter text.
The spell checker was locking up with a mismatch between aspell and aspell_en versions.
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