Viewport bugged

[anthonyBA]

Hello
I have a problem with the viewport, it was all normal at first but one day it bugged out.
The "camera cube" is all black now and the grid doesn't smooth anymore when activating smooth wireframe it actually
gets worse.

I already uninstalled all Autodesk software
- deleted all the installation directories
C:\Users\%username%\AppData\Roaming\Autodesk
C:\Users\%username%\AppData\Local\Autodesk

\Users\%username%\Documents\maya\
C:\ProgramData\Autodesk

also deleted the registry entries
- HKEY_CURRENT_USER\Software\Autodesk
- HKEY_LOCAL_MACHINE\Software\Autodesk

then reinstalled Maya but it's still bugged?:(

here some screenshots

[anthonyBA]

oh and also x-ray doesn't work anymore