While rebuilding my Reboot Child Theme for SP 6.x compatibility, I discovered the following issue in the core Reboot parent theme file...

/sp-themes/reboot/templates/mobile/spGroupViewMobile.php:102

sp_SectionEnd('', 'eacgroup');

should be

sp_SectionEnd('', 'eachgroup')

That is all, so far...

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Good day Jim
Sorry this has not been answered yet. And apologies for the mis-spelling there. Good catch.
Fixed ready for the next update...

Thanks for the quick fix!