Open Rail Designer - Freezes

Hi,

I’ve recently installed Open Rail Designer (version 10.06.00.38), but it is very hard to use it because freeze very often. Even on simple task like draw a line it can freeze for 10min.
Does anyone know what may cause this. Any ideas to solve the problem.
I’ve run ORD on Windows 7 sp1 64.

Thanks & Regards

Jakub