Could you please let me know the exact version of Lightroom installed on your computer?
Also which operating system are you working on, Windows or MAC?
Which key did you press on the keyboard, and if you could attach a screen shot it will be helpful.
Please press the F6 on the keyboard and then the Filmstrip should reappear, select the image and see if it shows in the develop module.
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There's a possibility that this is caused by a defective monitor profile - Windows 10 sometimes installs bad manufacturers' profiles and sets them as default.
As a troubleshooting step, and possibly a temporary fix, try setting the monitor profile to sRGB.
If that fixes the problem, you should ideally calibrate the monitor with a hardware calibrator.
Press the Windows key+R, type colorcpl, and hit Enter.
Add the sRGB profile, then set it as Default profile. See screenshot (from Windows 7) below.
At first, many thanks for your answers.
When I tried to implement your ideas, I noticed that the problem apparently only occurs when I select the picture of a smart collection.
When I select the picture from a folder everything works as usual. I use lightroom only a short time. Probably I make a mistake with the smart collection.