yes it could be. after uploading the new files did you go to the wp_admin/upgrade.php page?
can you revert it back to the previuos one?
And what version was before upgrade?
reset to default, then back to the option you had.
edit your .htaccess file and add the code above (php_flag..) to it at the very top.
That worked out for me for the moment.
for the moment got it sorted out by adding the top 2 lines in the .htaccess file, but i really want to get this sorted out without the error reporting off:
php_flag display_errors off
php_flag display_startup_errors off
# BEGIN WordPress
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /blog/
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /blog/index.php [L]
</IfModule>
#END WordPress
