In the 2012-02-26 19:48 revision of this answer the word "only" is erroneously not displayed at the end of the first line in the case $\rm\:n > 1$, in IE 8.9.7601.17514, see screen grab below.
After rolling back to the 2012-02-26 19:48 revision, I opened your answer in IE8 from a Windows XP virtual machine, but I couldn't see the missing "only":
On my main machine, I tested the IE7 and IE8 compatibility modes, as well, but couldn't see anything amiss.
The only thing I can think of is one of the "Related" questions' titles contained LaTeX that interfered with rendering.
Please let me know if you see this behavior again.