The 'Unity game view not working' error may be caused by various reasons.
One of the main causes could be related to the resolution settings of the Game View window. If the resolution is set higher than your monitor's resolution, it might prevent the Game View from displaying correctly.
Another common cause could be that you might have accidentally toggled off the visibility of the Game View. In Unity, different panels such as Scene View, Game View, and Inspector can be toggled on or off.
Sometimes, certain scripts or components in your project might cause issues with the rendering of the Game View. These could include shaders that are incompatible with your hardware or graphics API, or scripts that interfere with the camera/rendering setup.
Lastly, there may be issues related to GPU drivers or compatibility problems between Unity and certain graphic cards.
To resolve this issue, you can try the following steps:
Check Resolution Settings: Make sure the resolution setting in the Game View matches your monitor's resolution or is set to a lower value.
Toggle Visibility: Check if the Game View is toggled on. You can do this by going to Window -> General -> Game, or simply press Ctrl+2 (or Command+2 on Mac).
Inspect Scripts and Components: Review the scripts and components in your project. Make sure there are no scripts causing unexpected behaviour in the Game View. If you suspect a certain script, try disabling it temporarily to see if the problem persists.
Update GPU Drivers: Ensure that your GPU drivers are up-to-date. If you're experiencing graphical glitches, this might solve your problem.
Reinstall Unity: If none of the above solutions work, you might need to reinstall Unity. There could be an underlying issue with the installation itself.