This issue was resolved in the middle of Sunday, the 21st. The system is now working correctly. We are very sorry for the outage.
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...logging into the XDK and authenticating with App Preview is working intermittently. The login and authentication system continues to experience issues. It is unclear, at this time, how long it will take to resolve this issue. Please have patience while this issue is being worked on.
As of Sunday the 21st there was some progress made with the login system, but there still appears to be some problems. Some people have been able to login, some have not and some are experiencing long delays. Please continue to have patience as this issue is worked on. Sorry, but I have no precise details on he problem, only that there is a known issue, that the issues is being worked on and there is no firm estimate as to when it will be fully resolved.
Also, regarding the offline behavior of the XDK, this is a known issue (that it does not behave well when working offline) and is something we have been working to improve with each release of the XDK. We are working to make offline use smoother (working without an Internet connection). However, there are some features of the XDK that simply cannot work without an Internet connection, to it is impossible to make the entire product work in an offline mode.