我遇到了同样的问题.花了几天的时间后，问题才被发现.

I have experieced the same issue. After spending a couple of days the issue has been identified.

我尝试将Magento 1.7.x升级到1.9.x，然后我的管理页面空白.

I've tried to upgrade Magento 1.7.x to 1.9.x then I got blank admin page.

修复

1. 下载Magento 1.9.x镜像: https://github.com/OpenMage/magento-mirror
2. 从当前安装中删除/skin/adminhtml，并替换为此.

这解决了空白的管理页面问题.

This fixed the blank admin page issue.

我希望这会有所帮助.