When switching back to mainline Arma started usually.
Switching back to 2.12 RC branch created the same crash. So it seems its not a issue because of my system or broken download.
The .rpt shows always messages like i posted in the section below.
When disabling the mod with the mentioned world, it will crash with another terrain mod the next time.
However, if i start Arma3 with only the mod it crashed with before, it doesn't crash. So it seems there is a combination of mods that will crash Arma3.
Maybe its the amount of terrain mods? Because i tried to crash it with a smaller amount of activated mods with no luck.
I will try to narrow it down more, but that will take time.