In general, if you are seeing an "Internal Server Error" appear in your browser, that will mean that there is an exception in your logs. You might also find out more information by opening Chrome's Dev Tools, using the Network tab to inspect which XHR calls are being made and find out the one that is returning the error (it is usually the request in red).
The browser's console logs are also a good place to look.
support.atlassian.com might be able to help you resolve this issue sooner.
At a guess, if you are using GreenHopper 6.0.6 or higher, and you have enabled the Epics Support labs feature, it is possible that you are experiencing this bug: http://jira.atlassian.com/browse/GHS-6495
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