Acrobat Pro 2020 shows defective colors on preview

[Vojtech22252991k6uf]

Hello,

the Acrobat Pro on my PC (Version 2020.006.20042) displays defective ("washed out") colors on PDF previews: It seems it displays CMYK-like colors instead of RGB.

The PDFs are RGB and display correct color in any other programs, even in the Acrobat Pro on an other PC with exact the same Color Management settings (Europe General Puropse 3, sRGB IEC61966-2.1).

Even in the PDF preview" in my Acrobat the colors are correct: After opening the file, the display wrong colors.

I tried everything and cannot find the cause...

Thank you very much for help!

Vojtech, Czech Republic