Most of the time, this issue is related to the fact your browser is not accepting cookies.
To avoid other similar limitations, we strongly suggest you reduce browser security for your AceProject website. For instance, with Microsoft Explorer, you may add your account website to your list of Trusted Sites as follows:
Tools (gear icon in IE9) -> Internet Options -> Security Tab -> Trusted Sites -> “Sites” Button -> type in website to add -> “Add” Button.