steady solution as an initial solution to an unsteady simulation / multigrid, cpu Booster

Hey, I have a fully converged steady state Simulation and want use this solution as my initial Solution for my unsteady Simulation. The mesh hasn't change. So the manual just say: Domain of row/ initial Sol/ Typ of initialization and then from Solution and then I choose the Simulation. Do I need to make any other settings ? 

So i copied the steady state simulation project, changed it to transient simulation and applied the above step.
In the steady state case I used the multigrid method ( 3 levels ) and the CPU booster . If I now read in the steady state solution and also want to work with multigrid and CPU Booster I unfortunately get an error message from the beginning: error: residual of mass is not a number: solver has stopped, some NAN have been detected. I reduced the CFL Number from 100 to 10 and the same problem. 

if i have only one multigrid level  in the unsteady simulationand use the cpu booster at the same time i don't get the error message anymore. But even with the cpu booster the simulation crashes at some point. I can only do the transient simulation without multigrid and cpu booster but I don't understand why.

greetings Hussein