When I wrote $\tilde S$ in an answer it was rendered correctly, but when I wrote the same in a comment, it looked like just an $S$ with a horizontal bar over it, as if I had written $\bar S$. And here on meta, it also looks like just a bar over an $S$.

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    $\begingroup$ Looks fine here. Let's try in a comment: $\tilde{S}$. Yup, also fine. Could be your browser, or the MathJax rendering engine you use. Which are you using? $\endgroup$ – Daniel Fischer Mar 28 '16 at 17:54
  • $\begingroup$ Test: $\tilde S$, $\tilde{S}$, $\displaystyle\tilde S$, $\displaystyle\tilde{S}$ $\qquad$ $\endgroup$ – Michael Hardy Mar 28 '16 at 18:50
  • $\begingroup$ Here on meta is looks correct in a comment but not in the posted question. $\qquad$ $\endgroup$ – Michael Hardy Mar 28 '16 at 18:51
  • $\begingroup$ This comment, I guess? Looks fine for me. $\endgroup$ – Daniel Fischer Mar 28 '16 at 18:58
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    $\begingroup$ The $\tilde{S}$ in the body of your question is looking a little off to me, but it looks right in the title and the comments here. Also the comment that Daniel Fischer mentioned looks fine to me also. $\endgroup$ – Sir Jective Mar 28 '16 at 19:10
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    $\begingroup$ I've seen this on numerous occasions (this post being one of them). In the end, I've blamed it on some zoom peculiarities. In this zoomed-in snapshot of this post (on 1920x1080) you can see that actually anti-aliasing is applied to make the "bar" in $\tilde S$ look slightly different from the one in $\bar S$. (Don't ask me how I noticed that slight AA difference.) Oh, and that is produced with HTML-CSS Fast Preview with STIX fonts installed on a Chrome clone/Win 7. $\endgroup$ – Lord_Farin Mar 28 '16 at 20:04
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    $\begingroup$ Don't use \tilde and \bar. Instead use \widetilde and \overline. Compare and contrast: $\tilde S\ \widetilde{S}$ and $\bar S\ \overline{S}$. $\endgroup$ – Asaf Karagila Mar 28 '16 at 20:56
  • $\begingroup$ $\widetilde S$ $\qquad$ $\endgroup$ – Michael Hardy Mar 28 '16 at 23:04
  • $\begingroup$ It works fine on Ubuntu with chromium. $\endgroup$ – Henricus V. Mar 29 '16 at 5:33
  • $\begingroup$ It appears that standard tilde $\tilde{X}$ versus wide tilde $\widetilde{X}.$ And bar $\bar{R}$ versus overline $\overline{R}$ differ on Safari. $\endgroup$ – Chickenmancer May 6 '17 at 18:12

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