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Please replace in field_group.module line #745:
$class_attribute = 'class = "' . $group->classes . '"';
with:
$class_attribute = ' class="' . $group->classes . '"';
to be more HTML valid.
The problem I experienced is that you could have invalid HTML like: <div id="x"class = "bla"></div>
With that line replacement its fixed.
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