Read the statement by Michael Teeuw here.
MM Shows a plain Black Screen on iOS 9.3.5 device
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 @idoodler FYI default modules only it still shows the same, I have a bit more time tomorrow so I’ll try reducing one by one to see if i can find exactly which doesn’t work - though I feel it’s likely going to be all of them 
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 Same problem here… iPad 2 with iOS 9.3.5 and I’m getting a black screen… I tried with Google Chrome, Dolphin Browser but no good luck. 
 A work around: Install VNC Server on RPi, and a client on the iPad. Go to fullscreen mode, and voila!
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 @pipe-line I think we have an iOs 9 device at work. I will debug it tomorrow night. What modules do you have installed? 
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 @idoodler I started with Current Weather and Weather Forecast and then only with Current Weather, but no lucky. 
 Thanks!
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 @pipe-line ok. I just gathered the iPad. Its an iPad mini running iOS 9.3.3. I hope I won’t forget it until I get home:) 
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 Issue has been identified. I am just preparing a pull request. Hold on tight! 
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 Lol. This issue has already been fixed on the 8th of April 2018 by Chris Pickett. It is available on the developbranch. It eventually will be merged with themasterbranch.
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 @idoodler thanks! I will try develop branch this night :) 
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 I also identified the issue. It is related to the use of Promises, a feature of ECMAScript 6, which is not supported by iOS 9.3.5. The feature is used in multiple javascript files that are built into the core of MagicMirror2. I believe it can be fixed with a polyfill. 
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 @thobach I don‘t think its an issue with the promise itself, but rather with the arrow (=>) operator that defines the callback. 

