Hello @iKettle
There number of possibilities here:
(1) Check the published version of your app and see which version is live.

Check if the most recent version is published. Like the image below, it shows that Version 3 is currently published which if in your case might have a blank home screen.

(2) Check the StartScreen of your app as there might be codes there that's detecting how it should be opened

Also, check if you have screens with Empty boxes.
(3) Try another browser. If you are using Chrome, don't add another user, instead, try Mozilla or Edge. Also, restart your internet connection. A possible cause might be an intermittent connection.
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