Could you try to add --disable-gpu in the parameter following this KB:
Let me know how it goes.
I'm not sure why this is marked resolved. The Confluence doc referenced by the Atlassian response did not address the OP's issue, which was a completely white screen, not an immediate error message as indicated by the Confluence doc. Also, a subsequent poster has the same issue, which is not resolved by the Confluence doc, as do I.
My instance of the issue seems to have immediately followed a Windows 10 Feature Update. When I launch the Windows HipChat client, all I see is a completely white window. Reboots of the computer and reinstallation of the client had no effect; the issue persists. No errors are raised in the UI whatsoever; not sure about logs. At this point the client is completely useless. Although I can use the web client, I prefer the native client, but it looks to me like Atlassian has some work to do to stay out in front of changes from Redmond.
It looks like Syahrul might have used that knowledge base article as a source of instructions for setting the client startup parameter - not necessarily because it was a direct fit for the behavior the original poster reported. Even so, the original poster was the one who marked Syahrul's answer as accepted.
The --disable-gpu flag can help with quite a few behaviors in the Windows client, including rendering a blank white screen (we had an old bug where this would happen after minimizing the client), but it's easy to see why this wouldn't be readily apparent to everyone.
Since we'll need to gather more information (log files, OS diagnostics, etc.) to understand the issue you're facing, I've opened a support ticket for you to do some troubleshooting. You should be getting an email to create an account in our support system.
I hope that helps!
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