I got an error code trying to upload pictures into Nexgen gallery. I check the php error log on my server and found the error here: wp-content/plugins/nextgen-gallery/products/photocrati_nextgen/modules/security/class.wordpress_security_manager.php on line 69
The error is "PHP Warning: Invalid argument supplied for foreach()"
That argument is the "HTTP_COOKIE_VARS" which is depreciated in PHP 4.01.
I'm not sure if that's what's throwing the error...
Here's line 69 in totalforeach ($GLOBALS['HTTP_COOKIE_VARS'] as $key => $value)