Strange shadows after updating Unity

This morning I updated Unity and then opened my project, but the directional lights are not working very wall cause they cast like a gradient shadow, how can I fix or go back to the precedent version?

78570-catdtura.png
Before the update

78571-cattura.png
After update (now)

Also when I hit play there are no shadows.

Okay I solved my problem, the question was really stupid, dunno why after the update the setting of the project quality changed from Fantastic to Beautiful. So if you have the same problem just check in Edit > Project Settings > Quality.