After the reinstallation the problem still existed. In addition, I noticed that the Taxonomy Manager didn’t work as well (and it was working for me before). It also gave me a blank page.
Then, I decided to play with the package versions and it turned out that UiPath.IntelligentOCR.Activities version 4.5.2 is the reason for my problems.
If I use version 4.0.1 it works out well for me!