Hi Atick,
Thanks for the quick response. Yes I have updated the Helix Ultimate to 2.1.3, but that alone did not solve the issue.
Indeed, the 'Predefined Header' setting had been nullified after saving Custom code changes in Helix, and now after re-activating the setting the header is showing again.
But the Megamenu font CSS settings have been lost. These lines should be included after the Helix Ultimate Custom CSS code lines in the head part of the page source code:
<style>.sp-megamenu-parent > li > a, .sp-megamenu-parent > li > span, .sp-megamenu-parent .sp-dropdown li.sp-menu-item > a{font-family: 'Arial', sans-serif;font-weight: 500;text-decoration: none;text-align: left;}
</style>
<style>.menu.nav-pills > li > a, .menu.nav-pills > li > span, .menu.nav-pills .sp-dropdown li.sp-menu-item > a{font-family: 'Arial', sans-serif;font-weight: 500;text-decoration: none;text-align: left;}</style>
But they have disappeared.
However, I could restore the previous font formattings by placing the above code in the Helix Ultimate Custom CSS section.