As we all know the new Source update broke zBLOCK. Fortunately v4.62 was released this morning so make sure you've all got it on your servers for ladder games & for the upcoming cups.
http://zblock.mgamez.eu/news.htm
EDIT : They fixed ambient occlusion wooop "Added cvar "zb_antismoke" (Default: 0)
When enabled players who are stood in the middle of a bloomed smoke grenade are not visible by the use of exploits."