In my terraineditor i want to get the position (x,y,z) of all my terrains. If i don`t use the physic (don`t do physX_open) then all works great, but if i use the physX all 3 parameters of all terrains are zero (x=0,y=0,z=0). Also destroy the physic don`t work and to unregister the terrains from the physic don`t work. how can i get these coordinates if i use the physX?

I've experienced this behaviour (bug?), too.
Workaround: Have a look at the ackphysx code, copy the physX_open and physX_level_load into your code, change the latter function as follows:
When ent_type == 4, you have a terrain. Now save its xyz-position somewhere (skills?) and register it afterwards.

Better solution: File a bug report.

Thanks, i will report it in the bug forum.