Hi! i have a real big problem when i connect to play with friends, in a friend's realm. i appear in the spawning area but as soon as i mine any cube it just banishes and i cant get the materials out of the cube. Besides, it doesn't even sound or look like its breaking, it just desapiars without leaving anything, so i'm unable to build anything. 
Sometimes i can see my friends jumping around me and doing stuff, but they can't see me doing anything. i can see them fighting or mining, but the don't see me doing it. they can even attack me and kill me, but i cant hit them. the enemies won't fight me either, they never attack, even if i'm standing in front of them. Creepers won't blow up, lava won't kill me and the map inside the realm won't load fully, so i can't even get to see everything my friends have done in the server. 

I hope you can help me, so i can play with my friends at least one time.