Adobe Camera Raw woke up with no standard Camera Profiles.

 Yesterday, ACR and Photoshop were behaving weird. This morning the Camera Profiles were empty with only colour and monochrome as choices. I asked Google Gemini, not a worthwhile reply. Then tried Microsoft Co-Pilot, slightly better, but didn't solve the issue.

Looked at 

• C:\ProgramData\Adobe\CameraRaw\CameraProfiles\
• C:\Users\<yourusername>\AppData\Roaming\Adobe\CameraRaw\CameraProfiles

Both empty folders.

and that worked

Photoshop was 25.9.1, reverted to an earlier version, no improvement.

I shut down Photoshop, went to 

    C:\Program Files\Adobe\Adobe Lightroom CC\Resources\CameraProfiles

then I copied the whole folder to

C:\ProgramData\Adobe\CameraRaw\CameraProfiles\

and re-launched Photoshop and Adobe Camera Raw and that worked.

Don't confuse yourself by testing on an edited psd, test by opening a fresh raw file.

See also:

https://community.adobe.com/t5/camera-raw-discussions/adobe-camera-raw-missing-camera-profiles/td-p/10087240