The justification problem with that paragraph is that it consists of only one 'word' - it has no spaces between any of its 346 characters. Consequently, Word is doing the best it can with a paragraph that allows hyphenation. Doubtless the problem would not exist if the paragraph had some meaningful text.

That said, you could improve matters for the current content by checking the 'Don't hyphenate' option, under Paragraph>Line and page breaks. That will still leave you with different-length lines, due to the fact the character widths differ. You could resolve that by using a font with fixed-width characters (e.g. Courier New) or via Ctrl-Shift-J (to apply text distribution). Neither of these is likely to be appropriate for production usage, however.

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]