IB Bresinsky

Hello, same happens with my project. Funny thing: I did it a few days ago and it worked allright. Yesterday, it stucks at simulations step with same symptoms as described by Marius! A first (older) version still works, but whenever I change buliding heights of the surrunding building (due to shadowing issues), it also stucks in simulation step. I am helpless and customer is waiting for results! I can provide both project files (working and non working). KR, Dipl.-Ing. (FH) Jan Bresinsky