Same happens to me, after 2.12.0 MM update, only the clock hands are shown.
Read the statement by Michael Teeuw here.

Posts
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RE: No numbers in analog watch face
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RE: Installing on a Pi Zero
I think electron is discontinued for raspberry pi zero, a few months ago I see a post in this forum talking about that. Now I can’t find that post.
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RE: 1 old noob + 1 rPi = I can't believe I did it! (revisited)
Yes, Raspberry Pi 3B+
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RE: 1 old noob + 1 rPi = I can't believe I did it! (revisited)
I’ve just discovered Eyecandy module, it’s great!! Thanks for your job!
Anyway, two eyes see better than one :face_with_stuck-out_tongue:
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RE: Bathroom Magic Mirror
I’ve tried that with a PIR motion sensor, and really doesn’t work very well. So I’ve finally decided to put it outside mirror.
Anyway, you can try it by yourself.
Hope it helps. -
RE: How to start smart mirror
Yes, always is a good idea to make a backup of a file before modified it :winking_face:
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RE: How to start smart mirror
On a clean installation of MM, only config.js.sample exists, I think. You have to rename it to config.js and configure it as you wish. If config.js doesn’t exists, you can not watch anything on the screen of your mirror.
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RE: How to start smart mirror
Take a look at your config.js file. At first installation, you have a file called config.js.sample. You must rename that file to config.js and try again.
The path to those files is: /home/pi/MagicMirror/config/