无法在Magento中编辑/保存和现有产品

我正在尝试更改现有产品，例如添加图片 . 我能够无错误地上传图像，当我按“保存”时，它看起来像是正确保存，但没有绿色的“成功”指示 . 当我重新打开产品时，图像不存在 . 我尝试更改说明，但也没有保存 . 似乎有些事情阻止我以任何方式编辑现有产品 .

以下是system.log显示的内容：

2015-09-19T17:41:34+00:00 ERR (3): Warning: array_key_exists() expects parameter 2 to be array, null given  in /home/username/public_html/app/code/core/Mage/Adminhtml/controllers/Catalog/ProductController.php on line 507
2015-09-19T17:41:34+00:00 ERR (3): Warning: array_key_exists() expects parameter 2 to be array, null given  in /home/username/public_html/app/code/core/Mage/Adminhtml/controllers/Catalog/ProductController.php on line 507
2015-09-19T17:41:34+00:00 ERR (3): Warning: array_key_exists() expects parameter 2 to be array, null given  in /home/username/public_html/app/code/core/Mage/Adminhtml/controllers/Catalog/ProductController.php on line 507
2015-09-19T17:41:34+00:00 ERR (3): Warning: array_key_exists() expects parameter 2 to be array, null given  in /home/username/public_html/app/code/core/Mage/Adminhtml/controllers/Catalog/ProductController.php on line 507
2015-09-19T17:41:34+00:00 ERR (3): Warning: array_key_exists() expects parameter 2 to be array, null given  in /home/username/public_html/app/code/core/Mage/Adminhtml/controllers/Catalog/ProductController.php on line 507
2015-09-19T17:41:34+00:00 ERR (3): Warning: array_key_exists() expects parameter 2 to be array, null given  in /home/username/public_html/app/code/core/Mage/Adminhtml/controllers/Catalog/ProductController.php on line 507
2015-09-19T17:41:34+00:00 ERR (3): Recoverable Error: Argument 1 passed to Varien_Object::addData() must be of the type array, null given, called in /home/username/public_html/app/code/core/Mage/Adminhtml/controllers/Catalog/ProductController.php on line 513 and defined  in /home/username/public_html/includes/src/__default.php on line 1019
2015-09-19T17:41:34+00:00 ERR (3): Warning: Invalid argument supplied for foreach()  in /home/username/public_html/includes/src/__default.php on line 1021