Brute Force capture image incomplete

Can you move your cursor over the captcha image, right click and select “open image in a new tab (or window)”. Does it look fine or all messed-up too?

Unfortunately it′s exactly the same behaviour, see screenshot:
https://drive.google.com/file/d/1oNtuCxeAyLw1n0hQx0Y3PVAMdTu1WQS2/view?usp=sharing

Copy the code below, save it to a file and name it ‘font.php’:

<?php
require './wp-config.php';
header( 'Content-Type: image/png' );
$im    = imagecreatetruecolor( 400, 30 );
$white = imagecolorallocate( $im, 255, 255, 255 );
$grey  = imagecolorallocate( $im, 128, 128, 128 );
$black = imagecolorallocate( $im, 0, 0, 0 );
imagefilledrectangle( $im, 0, 0, 399, 29, $white );
$text  = 'Testing font...';
$font  = WP_PLUGIN_DIR .'/ninjafirewall/lib/share/font.ttf';
imagettftext( $im, 20, 0, 11, 21, $grey, $font, $text );
imagettftext( $im, 20, 0, 10, 20, $black, $font, $text );
imagepng( $im );
imagedestroy( $im );

Upload that file into the root folder of WordPress, then access it https://example.com/font.php. Do you see the “Test font…” message?

Unfortunately totally messed up…
https://drive.google.com/file/d/1pMfydJ4zTCIr2UF2-deiPwXiXlBghPi7/view?usp=sharing

Maybe the font file, “ninjafirewall/lib/share/font.ttf”, is corrupted?
We just released v4.5, can you update and test again? If the file is corrupted, the new version will reinstall it.

Hi,
just installed the new version and tested but unfortunately still messed up…

Is it your own server or a shared hosting account?
Did you or your host upgrade PHP or make some changes to it?
The example I gave you is the one from the PHP manual ( https://www.php.net/manual/en/function.imagettftext.php ) but obviously, it doesn’t work anymore on your server.

It is on a shared server but we did not get any info about PHP upgrades or re-configurations.
Will check with them.
Thanks for your support.