Sylvaen

On a sidenote, I’ve edited the “scripts.php” file of the plugin and changed
add_action( 'get_header' , 'bp_like_insert_head' );
to
add_action( 'get_footer' , 'bp_like_insert_head' );

The issues stopped, and the plugin is still working. This hotfix is mentioned in https://www.ads-software.com/support/topic/update-to-019-something-not-working?replies=9

Confirmed. The SCRIPT element with string definitions comes before doctype, which results in defaulting to other doctype, and breaks the theme.

I’d suggest using jQuery queuing, ie set the variables in a $(document).ready() call, and initialize the functions on $(window).load(), which happens later in the process.