I just purchased Mathematica (13.3.1.0) after using it briefly 20+ years ago, so I'm walking through basic tutorials. One included...
Apart[(2 x^2 - 3)/(x^2 - 3 x + 2)]
...which correctly decomposes the rational expression, but then the kernel immediately exits and loses existing references in the notebook. Similar commands like...
Apart[(3 x^2 - 3)/(x^2 - 3 x + 2)]
Apart[(x^2 + 5)/(x^2 - 5 x - 6)]
Apart[(x^5 - 2)/(2 + x - 2 x^3 - x^4)]
...complete without any issues and the kernel keeps running. Is there some subtlety I'm not seeing here?