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Hello Tal, in order to activate the breadcrumbs for HelloMix, go to: appdesignfrontenddefaulthellomixlayoutpage.xml ,find and cut this line:
<block type="page/html_breadcrumbs" name="breadcrumbs" as="breadcrumbs"/>
and paste it out of the header block, (woud be in the line 84).
Hope that helps, regards.-