By default, BlueStacks is stingy with resources.
8 Ball Pool works best with or DirectX depending on your PC.
The most common reasons for "not working" include:
Open settings and allocate at least 4 Cores and 4GB-8GB of RAM (or half of your PC's total capacity).
If nothing else works:
Here is a comprehensive guide to getting your game back on the table. 1. The "Silver Bullet": Create a New Instance
