Descriptive Problem Summary: When there is more than a single player on the server , both players screens flash when the second player gets hit either that or the zombies become invisible , I was taking damage and the health bar was going down but the health value 100/100 stayed the same.
Numbered Steps to Reproduce Problem: More than 1 player on the/a server.
Does the problem occur:
Every time? Or how often? Everytime.
When does the problem NOT occur? When Playing Alone.