Eli Zaretskii <eliz@gnu.org> writes:

>> From: Thomas Schneider <qsx@chaotikum.eu>
>> Date: Tue, 01 May 2018 18:16:42 +0200
>> 
>> The same problem still happens with Emacs 26.1.
>
> Can you send a screenshot showing the empty menus?
Sure.  This is with emacs -Q, so instead of AUCTeX as described in the
initial report, this is Emacs’ TeX mode (I don’t know what it is really
called), but the problem is the same nonetheless.