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Ok I did that too.
Yes the problem comes from file writing permissions.
In your site wpforo have not a permission to write into file
/wp-content/plugins/wpforo/wpf-themes/classic/colors.css
The right way to solve this problem is fix files and folders permission.
All files in FTP to be have a chmod 0644 and folders to have chmod 0755
The another way to fix this problem.
- Open file /wp-content/plugins/wpforo/wpf-includes/wpf-hooks.php
- Go to line 1025 and change this code line to this code
wp_add_inline_style( 'wpforo-dynamic-style', $css );
3. And Go to line 1028 and change this code line to this code
add_action( 'wp_enqueue_scripts', 'wpforo_dynamic_style', 12 );
after all changes save this file into FTP and try refresh Forum Page with Ctrl + F5
Ok, thank you very much!