Custom fields vanished

After applying 2.5.0 update The entire custom fields section vanished from admin>products. However the data is intact in the db. Could anyone help in resolving the issue
Here is the screenshot

http://www.awesomescreenshot.com/image/942566/1b74458ae5803109eab8626eb64241f0

https://ww.wp.xz.cn/plugins/woocommerce/