Hyde105

I found a solution for my problem, I noticed menus, widgets and some other stuff wasn’t working properly for me neither and only on my personal website. All the other sites I admin did not have these problems.

This step is what fixed it for me:

BulletProof Security – https://www.ads-software.com/extend/plugins/bulletproof-security/
Update to the latest version (.47.7) to fix issues with javascript functionality in WordPress not working correctly.
Note: You can still have this problem if you have *ever* used the BulletProof Security in the past, even if you have removed it. If you are experiencing problems with menus and widgets and the editor and similar not working, and you have ever used BulletProof Security, even if you’re not using it anymore, then look for an .htaccess file in the /wp-admin directory, and delete it if it is there.

Latest WP + NG

Server settings:

Operating System : Linux (64 Bit)
Server : Apache/2.2.16 (Debian)
Memory usage : 44.14 MByte
MYSQL Version : 5.1.66-0+squeeze1
SQL Mode : Not set
PHP Version : 5.3.3-7+squeeze3
PHP Safe Mode : Off
PHP Allow URL fopen : On
PHP Memory Limit : 64
PHP Max Upload Size : 16M
PHP Max Post Size : 16M
PCRE Backtracking Limit : 500000
PHP Max Script Execute Time : 30s
PHP Exif support : Yes ( V1.4 )
PHP IPTC support : Yes
PHP XML support : Yes

All my sites are hosted at: mijndomein.nl

I have the same problem with the following pages:

Add Galery/Images
Options

And when I use the Upload Pictures button on the Overview page, blank screens. No warning messages whatsoever