Thank you for reporting.
I hope I’ll be able fixing it soon.
For now i fixed it by adding a condition in the code…
in the file wpsongs-contenthooks.php
//if not post type song, end proccess
if(is_search()||is_archive()||!is_single())return$songbook_toedit;
//add backtolist link to content
if(get_option('songbook_disp_backtolistinsong')=='display'){
$posturl=get_permalink(get_option('songbook_shcdefs_listpageid'));
$songbook_backtolistlinklink='<a class="backtolist" href="'.$posturl.'" title="'.__('Go back to song list','wpsongbook').'"><< '.__('Go back to song list','wpsongbook').'</a>';
}
I added a if(get_post_type()=='song')
I am not sure it’s the best way to fix it but it works for me.
sorry i dont have the exact modified file here… but i guess it’s clear enough, otherwise i’ll post the exact modif soon if needed
Cheers