One thing we see a lot while working with athletes is poor elbow positioning and lack of back tension when pressing. Lack of upper back tension and poor elbow positioning can lead to:
-Lack of shoulder stability during lift
-Pressing with a broken wrist
-Lack of lat activation
-Increased stress on the shoulder joint
Here are a couple videos from Cressey Sports Performance about the difference in elbow position during the bench press and a training technique for improving back activation and elbow positioning during the bench press.