Just downloaded Photoshop CC today but I find that the entire 3Dpanel is grayed out, even when I open a picture in the application frame. Can someone help?
the issue is either your OS (32-bit windows doesn't support 3D) or you graphics card isn't compatible (doesn't have 512MB of dedicated VRAM) or the driver for you graphics card is out of date.
If that doesn't get it working, it may help if we could see your Photoshop System Info. Launch Photoshop, and select Help > System Info... and copy/paste the text in a reply.