Please follow these steps
- Make sure the 3DTV Play Activation Utility is successfully installed
- Make sure your Trial has not expired
- Make sure stereoscopic 3D is enabled from the NVIDIA Control Panel
- Try launching the "Test Stereoscopic 3D" from the NVIDIA Control Panel.
- Restart your 3D game and run it at a supported 3D mode (e.g. 1280x720 at 60Hz)