burgermenu disappeared after update

Hey Erwin,
I see that you are using a child theme, do you have any modified theme files in your child theme, such as a header.php?
Can you please include a admin login in the private content area so we can take a closer look.

Best regards,
Mike

Hi,
I see that you do have a old header.php that should be updated with a current version because Enfold v4.1.1 has some new functions in it, that has caused issues for sites that use a child theme and a old header.php with the latest version. Mostly the errors have to o with the lightbox script.
Since you said you developed this site a while back and don’t remember your changes, I created a difference report between your child theme header.php and the header.php in v4.0.7, so you can see your changes and then figure how to incorporate them into the v4.1.1 header.php
Please see link in the Private Content area.
I also see that your child theme style.css has a warning that there are 66 errors that need to be corrected.
These two issues could be the cause for your issue, please try addressing, and let us know if this helps.

Best regards,
Mike

Hi,
Thank you for checking and ruling those possible issues out.
I took a look at your one error and it turned out to be a misspelling, so I fix it.
I also found your menu issue, it was this in your css on line 30:

.logo {
   margin: -37px 0 0 0!important;
   z-index: 80;
}

the -37px was pulling it up, so I changed to -17px which seems to look good, but feel free to adjust to suit.
I also noticed that the mobile menu opens under the slider, this is due to a z-index of 900 on line 197:

div#full_slider_1, .topper {
height: 225px;
z-index:900;
position:relative;

}

So I changed it to 100, but feel free to adjust to suit.

Best regards,
Mike