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Every once in a while I want to post a question or an answer and the controls are missing and the preview area never populates. In fact, this is happening to me with this question right now. Here's a screenshot:

screenshot

If I submit a post when this happens, I get the "Human Verification" dialog with a captcha; normally I don't get that.

Reloading the page doesn't fix the problem. What causes this and how can I fix it?

Addendum: Loading the initial article page (Is this rule for graph isomorphism true? in this case) produces the following diagnostics on the JS console:

* The connection to wss://qa.sockets.stackexchange.com/ was interrupted while the page was loading. full.en.js:1
"soup injecting fixes" SOUP.user.js:1158
"soup init complete" 950257:29
"soup setup complete" 950257:29
"soup mathjax config loading" 950257:29
"soup adding vote event handler for mse115702" 950257:29
"soup JS fixes applied" 950257:29
* no element found a930:1
* TypeError: SE.mathjaxEditingNew is undefined mathjaxMSEincremental.user.js:773
Use of getPreventDefault() is deprecated.  Use defaultPrevented instead.

Items with stars are errors.

On the other hand, this page shows the same problem for me just now, and the console doesn't show any of those errors, so I'm not sure the errors are related.

Added 20141010: The problem was caused by an obsolete GreaseMonkey script. This bug report can be closed.

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closed as off-topic by Glorfindel, José Carlos Santos, Saad, TheSimpliFire, Brahadeesh Dec 27 '18 at 11:53

  • This question does not appear to be about Mathematics Stack Exchange or the software that powers the Stack Exchange network within the scope defined in the help center.
If this question can be reworded to fit the rules in the help center, please edit the question.

  • 2
    $\begingroup$ Any errors in the Javascript console? The symptoms are consistent with WMD or related script failing to load. $\endgroup$ – user147263 Sep 28 '14 at 23:48
  • $\begingroup$ That's a good idea, thanks. I'll take a look next time the problem recurs. $\endgroup$ – MJD Sep 29 '14 at 0:37
  • 3
    $\begingroup$ This question appears to be off-topic because it is about a localized problem caused by a userscript. $\endgroup$ – user147263 Oct 10 '14 at 15:16
  • $\begingroup$ I agree. I have voted to close it. Admins should change the tag to wontfix or whatever is appropriate. $\endgroup$ – MJD Oct 10 '14 at 15:25
  • $\begingroup$ Or you could just delete it, saving others a few clicks... $\endgroup$ – user147263 Oct 10 '14 at 19:05
  • $\begingroup$ I'm leaving it, in case someone else searches for those error messages. $\endgroup$ – MJD Oct 10 '14 at 19:48