I found the problem, it was the RK_Contact responsive Contact form plugin. I could have sworn it was working with it in before, but I deactivated it, refreshed on my mobile, and the menu came right back. I reactivated it, refreshed, it was gone. I deactivated it, it was back. So I replaced it with another Contact form plugin, seems to work fine now. Thank you for your help
One other question, unrelated to the above; my client who I’m building the site for, wants a line of information placed right below where the Copyright line is. I’ve hunted around, and I can’t seem to find which file that information is in. Can anyone help me on that?