I’ll say right away that I don’t even know where to look in principle (forum on mybb). Then everything is in order.

enter image description here

See this arrow opposite the greeting? The code structure is as follows:

The arrow is the fa fa-caret-down class from font awesome, it is wrapped in the ID "ddmenu", that is:

<a href="" id="ddnmenu">С возвращением, admin! <i class="fa fa-caret-down">::before</i></a> 

I understand that when you click on any place (the same div), a menu should appear that does not exist.

The console displays the following:

 Uncaught ReferenceError: use_xmlhttprequest is not defined at (index):91 

in which the #ddnmenu div is present, only for some reason documented (I have not documented anything):

 <script type="text/javascript"> // <!-- if(use_xmlhttprequest == "1"){ $("#ddnmenu").popupMenu(); } // --> </script> 

The whole joke is that (I have already said that I have not documented anything, I keep the forum on localhost so far, so no one could climb) I don’t even know where this piece of code is. I searched in the search (through the program) for the word "ddnmenu" in all folders (including nested ones), found only an XML file with all the contents. But also (a lot of prikolus arises), I note that by default it is documented (the same top one). That is, apart from this file, there is nothing else. Question: What should I do if I cannot find anything?

UPD: Googled a problem, found 4 more people, everywhere it was answered that I checked the Js files in the folder and checked if the Enable XMLHttp request function was enabled. It all helped, I did not. Everything was in place by default, everything worked by default. It turns out that something is wrong with localhost? Although I deny it (but, perhaps, something is present), because just yesterday everything worked on LAN. Completely deleted the theme, folder, set clean, nothing helps. What kind of idiocy - I do not know. If you update the topic, it is not in the admin panel (there is no such function there), but it is fresh. A problem with

 Uncaught ReferenceError: use_xmlhttprequest is not defined at (index):91 

after reinstallation was gone, but the menu still does not want to get out. Deaf deadlock, or where there is a loophole - I do not know. I do not know how you try to help me. It's just toffee (here meant mat). Whether to pour holy water, or priest call, an extreme option.

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