If your website won't load after updating to BuddyPress 12.1.1 it is likely a conflict with bbPress or another BuddyPress compatible plugin. Install the BP Classic plugin to fix this issue.

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How do I add/remove breadcrumbs?

The breadcrumbs shown in the demo are added by the Yoast WordPress SEO plugin. Install this plugin and then go to SEO -> Search Appearance and click the Breadcrumbs tab and click Enabled.