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Using mozilla, when viewing the article titled [[spread polynomials]],
which only I have edited so far, in the section called "Table of spread
polynomials", I find that the line right under the one that begins with
"S_4(s)" contains only the symbol x_1, but when I try to edit it, the
material that should be there instead is there.  Using a different
browser, the material was displayed correctly.

Works for me in Mozilla 1.7.8 on Mac OS X.

Checked browser cache?

Please clear your cache and try again. I tried here and it
looks fine. Reopen the bug if it is still occuring.