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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I cannot see the icons on my site?

This is probably because of a permission issues with the font used to display the icons. Using an FTP client set lib/fonts/ and lib/fonts/fontawesome/ permissions to 755 and the font file permissions to 644.