Read the statement by Michael Teeuw here.
Black screen after 2.13 update - tentatively resolved
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 @swvalenti let me work on it. is that a pi0 perhaps, running chrome instead of electron? 
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 No sir it is a pi3b+ running buster 
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 @swvalenti after looking at my dev console I see the same content security warning, but it is not fatal… just a warning… I added the requiresVersion: "2.1.0",to the calendar and it worked fine, 
 then commented out//requiresVersion: "2.1.0",still worked ok… and didn’t need that meta tag… so, there must be something else going on… can u rename the config.js out of the way (config.js.save) 
 and copy the samplecp config.js.sample config.jsand try MM again 
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 @m0bed said in Black screen after 2.13 update - tentatively resolved: @m0bed So, I changed my config found out that this modules dont work at the moment: 
 MMM-Homematic-HeatersThe problem are the comments in the two translation files . Remove the comments and it will work again. Since MMM-Homematic-Heaters seems to be no longer maintained, I have forked the module MMM-Homematic-Thermostats from it and developed it further. There the error is fixed. Maybe changing the module will help :-) 
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 Somehow it was the MMM-DailyPokemon jacking all things up. Removed and all is working fine again. 
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 @swvalenti probably the comments in the translation files, en and fr 
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 Yes that is the error it was showing but I didn’t know how to proceed in fixing. 
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 @swvalenti edit the json files in the translations folder and remove the comment. one of the others does not have a comment for example 
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 Outstanding, that worked! My son thanks you 
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 @sdetweil 
 I run npm install in the …\MagicMirror FolderOk, in future I will use your script 


