Read the statement by Michael Teeuw here.
some modules are not showing on screen
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 try rebooting your system 
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 Thanks for your answer, but of cause (didnt say - I know) - already rebooted .( Anyway, rebooted again - no effect. I also stopped the autostart with pm2 stop mm before to prevent a double runnig MM o.O. No effects anyway. 
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 try npm start devselect the console tab of the developers window 
 scroll to find any red text, which are errors…another user just had a similar problem, which turned out to be some file system problem on his memory card. 
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 hm ok. I am on console (ssh). 
 So I have to work on the Pi directly with GUI to check that, right?
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 @stephen yes 
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 Sorry, but, dont know how to do that o.O feel like a noob I’ve used VNC to get the GUI, but where to find the dev window? I’ll started from the terminal/console. 
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 @stephen no idea over vnc… attach a mouse to the pi… 
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 Its the same like a mouse connected. Sure I can connect a monitor and mouse+keyboard, but I dont know how to get to the dev window. I dont coded anything on the pi directly (like I am using visual code at windows for example). So how to get the dev-output? 
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 @stephen on your remote console, do ssh to the pi, no gui cd MagicMirror export DISPLAY=:0 npm start devand, of course, you need a monitor on the PI 
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 Thanks! 
 I’ve connected a monitor and keyboard. Connected via ssh and started like you’ve posted.Uh great output. Never seen :) … but I am not a node-nerd yet. Anyway… There are errors to the modules I’ve missing. In every case there is an error loading the skripts. In the log I saw there is a “/” too much while executing. For example: 
 GET http://0.0.0.0:8080/modules/internet-monitor//internet-monitor.jsSame at the other modules. But why? Where to correct this? 

