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  • Thanks for jumping in John, unfortunately, nothing helps.
    I have this on multiple local and server installations right now! what on earth can cause this?
    I get these errors when updating a page with debug on:

    
    Notice: De aangeroepen constructor methode voor WP_Widget is verouderd sinds versie 4.3.0! Gebruik
    __construct()
    in plaats daarvan. in /Users/boriskamp/Documents/Local Websites/remons_barbershop/wp-includes/functions.php on line 3457
    
    Warning: Cannot modify header information - headers already sent by (output started at /Users/boriskamp/Documents/Local Websites/remons_barbershop/wp-includes/functions.php:3457) in /Users/boriskamp/Documents/Local Websites/remons_barbershop/wp-admin/post.php on line 242
    
    Warning: Cannot modify header information - headers already sent by (output started at /Users/boriskamp/Documents/Local Websites/remons_barbershop/wp-includes/functions.php:3457) in /Users/boriskamp/Documents/Local Websites/remons_barbershop/wp-includes/pluggable.php on line 1207
    

    any clues? it’s all in the WordPress files, I don’t understand this at all, how can this happen?
    I tried manually overwriting the server files with clean new ones as well and nothing helps.
    I need this fixed, this is unacceptable to my clients, just because of an update.

    What can I do figure this out some more?