Last line of justified paragraph has four words that are too widely spaced. If I unjustify that line, the whole paragraph unjustifies.

It sounds like your last line has a soft return (new line) on it instead of a hard return (normal paragraph mark).

If you put your cursor on the end of that line and press Enter does the problem resolve?

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Andrew Lockton
Chrysalis Design, Melbourne Australia

You are right; that was exactly the problem. Thank you!