i entered map downloaded few seconds before, and then observed really weird thing (look on zip below), i saw something like this firs time, btw it's very nice bug ;)

http://cooz.webpark.pl/ghost_bug.zip

ps
if someone had thi before sorry - i dont have time to search whole this secion ;p

Yes, its a fairly old bug. Its not entirely clear exactly what causes the bug or why. It can be solved by rejoining the server.