I have a blank page in place of the helper

This trouble come from conflict with the x-frame options of your server. Look at whether the plugin succeeded in writing this following lines in the .htaccess of your wordpress appli if you can:

    # BEGIN Lf-hiker plugin
    <IfModule mod_headers.c>
    Header set X-Frame-Options SAMEORIGIN
    # END Lf-hiker plugin 

It resolve the trouble for me.
You can find more information about this trouble in wordpress support Multiple ‘X-Frame-Options’ headers with conflicting values

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