Hello,
i identified the problem.
I changed in the Repetier-Konfiguration the drawing-method from "Automatic" to "Direkt".
VBOs (fastet) = Problem
Arrays (middle) = Errors (error:OutOfMemory)
Direkt (slowest) = i can pick again the objects.
It seems, Repetier has a problem of using the fast VBO-Technic.
Maybe you can fix it in the next update?