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 to change the membership circles image on the homepage?

Edit the page called "Home Original", and click the blue Backend Editor button to show the WPBakery Page Builder editor if you haven't done so already. 

Now follow the steps in the image below: