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 hub categories to my navigation menus?

Go to Appearance -> Menus and in the top-right corner click the Screen Options button and check the Hub Categories option. You will now be able to add hub categories to your menus.