Log in on SMP Various Problem (nether, chests, delay)

Logging on:
When i log on the server i the screen opens up in a black picture like i am getting suffocation damage (screenshot).
When the normal picture of the world loads after 30 seconds it is like my game i delayed. When i try to type in the chat nothing happens. I don't take falldamage or i can't open chests.
After a minute or so my game cathches up and all the chests i have opened open all at the same time. The chat comes up with everything i have typed.

Another Bug is when i travel to and from the nether. I get the same black picture and get teleported everywhere. Sometimes underground.

I also get random damage riding a minecart.

PS: The TAB key doesn't work on MAC.