I think I found how to crash all the time!
Step 1 : put "ESCAPE" for "Pick Block"
Step 2 : open a chest
Step 3 : move the mouse over an item in his inventory
Step 4 : do ESCAPE
New test, same problem with Java updated.
You could test with the map I uploaded, please ?
This map was created this night with 1.4.5.
Ok Thx, tonight, I will upgrate my java and will test.
I have the same problem with version 1.5.1.
This bug when tp the people on chunks uncharged. (commandBlock)