I looked into your problem, but I couldn't find a solution. For over an hour I kept on searching for clues. Let Efil look into the problem., may be we need to contact server support / cPanel support.
However, your account usage is over 3GB, not 1895.84 Meg as you said before. Have you checked the "/z/" directory in your account, it is more almost 3Gb, is it ok?