Photoshop CC 2018: Doesn't open images correctly, just shows black image or the "transparent" screen

Hello everybody, I've just updated my Photoshop and Lightroom to CC 2018, Lightroom seems to work correctly (even if I can't find some old feature, might need to dig a bit deeper), but Photoshop is just giving me problems over problems.
When I try to "Edit" a photo firstly adjusted in Lightroom, it shows just a black picture, or the transparent background:



As you can clearly see from the layers, the image looks alright there.

This happen even if I try to manually open the image from Photoshop, or if I try to edit the RAW picture from Photoshop and then edit it (it let me edit the RAW picture but, once opened, it just shows a black picture or the transparent background).

The same problem happens if I try to open a simple JPG or PNG image.

In the homepage of Photoshop I can see the images as they should be:



I've already tried to remove the "Use graphic processor" from the preferences and restart Photoshop, but it didn't change the result.

I've even tried by uninstalling it and reinstalling it, still without success.

Any suggestion please?

Thank you all