I joined a fun minecraft server recently, and had a blast. No problems. Then, I died once, and then a bunch of things happened. At first, I couldn't be seen by anybody, but I could see other people. Then I couldn't use pressure plates. Later I fell in lava, could be seen again but could not be hurt or pick up any items. Oh, and for a while when I used a Minecart, I crashed. Please help!
I also bought the game yesterday night and this is my first day playing.