Sorry, no qt stuff here, but I have rxvt-unicode with the same problem. So,
it's not gtk specific.

(In reply to LoneVVolf from comment #5)
> Installed gvim to verify, and that has no menus AND shows no text.
> It looks like both of us have the same issue, but i have an additonal one:
> no text at all in affected programs.
> 
> I'm running archlinux x86_64 with xf86-video-ati on an AMD HD 4870.
> xorg 1.19.6, kernel 4.15.5
>  
> programs without text in menus on my system : 
> openbox, lxde, gvim, libreoffice, firefox gtk-filechooser, thunderbird
> gtk-filechooser
> 
> No issues at all in qt programs like lxqt, kwin, gwenview , okular, calligra
> .
> 
> Could you verify whether qt programs have issues ?