when ever i play this player , and its tournaments , the second they either enter the room or i do , i get a security warning and freeze , blocking me from playing...only happens with this player...any ideas why or anyone else get such problems ?

he is maybe a premium member and that does affect others while he plays( those not premium)

revert to java 8 31 and things should be fine..(delete all other java first and don't accept an update of this version.

Two times that I played the game with him in which I won both times. He rudely insulted me personally and moaned that I was incredibly lucky even though I wasn't. I blocked him, he is the worst person I have seen on here. It wouldn't surprise me if he knows some sort of cheat to freeze the game!