Sorry to hear you are facing this problem.
There's a couple of possible bugs that could be causing your dashboard data to display a blank page when selecting to "View as a Wallboard". Please, follow the steps below to properly troubleshoot it:
1 - Check if the problem happens when you are in incognito mode and using a different browser.
2 - Check if you might be facing any of the bugs below:
3 - If the bugs above do not apply to your current scenario, please provide us what gadgets you are currently using in your dashboard together with the respective filters added to the gadgets.
Let me know if you have any other questions.
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