Mac OS 10.4.2, Nexuiz 2.4.2.

Scince previous week my character is not manageable at all: it moves incorrectly, appears in different places and gets back suddenly, doesn't react on my commands - looks like it has devil in his head. As a result it's impossible to play 2 of 3 times i start to.

Please help!

It seems to me this is a lag issue. Keep pressed your tab key while you are in game, with ping higher than ~300 ms you will notice a behaviour like this. Check your internet connection, choose servers near you, stop bittorrent while playing

Or maybe your computer needs an exorcism?