Problems with Hair (Blendinglife)

here is image:

Quite self explanatory. But just to make sure. What the hell is that aliasing shit over there?? The mesh and hairs are on same layer. (layer and renderlayer)

Any ideas whats going on?

update: Its caused by CompoNode process where i Alpha over the meshes over the BG… !!! WTF is that…

update: Something to do with two objects fighting over for Z, or something. Put another object betwen the “joint” and it also got fucked up by the objects on foreground.

SOLVED : (Thanks to ZanQdo and Briggs), Put Save Buffers and Full sampling ON from Render panel

thats cool to know, i had some issues like this in the past and couldn`t quite figure it out why it happens…thanks!