For the last few days, I have been missing live edit preview windows on math.SE. The same bug occurs on multiple browsers and multiple machines. It does not occur on other SE sites, e.g. matheducators, nor does it occur if I use a different IP address (I only tried one, in Europe). So, strangely, the bug appears to be IP specific.
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$\begingroup$ I have searched whether there is something similar on other metas, but I only found this post on Meta Stack Exchange: Preview no longer showing when editing/composing questions and answers. $\endgroup$ – Martin Sleziak Feb 25 at 7:27
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$\begingroup$ @MartinSleziak Thanks much, your link helped me determine that the preview somehow got disabled, and I missed the "show preview" button that toggles it back on, sigh. $\endgroup$ – Bill Dubuque Feb 25 at 7:48
Thanks to Martin's link, I noticed the "show preview" button I don't know how the preview ever got into a hidden state, but now it works fine after re-enabling it.
Unhiding it on one machine also unhid it on other machines (at the same IP). So it is somewhat puzzling what the scope is for this user setting, i.e. it seems to somehow be tied not only to user-accounts but also IP addresses (or at least it appears so in this case). Possibly this is a bug.
I will leave this question up since it may help others who find themselves in a similar predicament.
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1$\begingroup$ Thanks for posting this. I encountered this as well. Indeed, keep the post. $\endgroup$ – amWhy Feb 25 at 18:16