Hi Tim - thanks for reaching out - I too am having this issue and reported it - I am told they are actively working on it - something to do with some of the host processes hanging - not sure if it is Qlik related or Amazon - I can update you as I learn more. It seems there are a few nodes that people are getting connected to - where the process hangs - if you clear your cache / cookies for example and retry - you may get connected to another node that is not inflicted with this issue. Let me know how you make out.
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"We are recycling the nodes in production right now and have run into unexpected disruptions in service. From a customer point of view this will cause App open errors. We anticipate this to be fixed momentarily."
Let me know if you are still experiencing the issue.
For Qlik Sense and qlikcloud.com to operate correctly requires stable websocket connectivity... perhaps this is the difference with your Windows Server 2012 R2 setup... could be an interesting factor to rule-out.