Upgraded to HipChat 4.0.1619 and I receive "something's gone wrong", followed by Try Again button.
After trying again, I see the HipChat screen, but there is a waiting/rotating circle in the main chat area and I can't see any of the chat content.
The list of other people is visible on the side bar though.
I'd definitely open at ticket with atlassian, https://support.atlassian.com.
You need to examine the logs, errors were probably thrown during startup.
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