subject selection its mot working in my new computer

Hi @Michel_Linares3216, Welcome to the Lightroom forums! Since you've already updated your GPU drivers, here are a few additional steps that may help resolve the problem:

1. Update Lightroom: Make sure you're running the latest version of Lightroom. 

2. Reset Preferences: Please follow the steps in this Helpx article: https://adobe.ly/3HsQXpA It is recommended that you back up your catalog before resetting preferences. You can take a look at this article for more information:  https://adobe.ly/4dW8vqF.

3. Disable GPU Acceleration: Try toggling GPU acceleration off under Preferences > Performance and restart the app.

4. Reinstall with Adobe Cleaner Tool: If the issue persists, consider doing a clean reinstall using the Adobe Cleaner Tool: https://adobe.ly/45DwoAQ

If none of these steps resolve the issue, let us know, and we can investigate the issue further. If you're on a deadline, I would recommend alternative masks as a workaround. You can use Select Background or Brush Masking and see if those work. I hope this helps! ^CH