Dear Dr. Nielsen, We installed the new Mcstas 1.1 version at PSI. We have the following problems 1. After compiling the program for the linup-1.instr example, it turns out that the globale double variables "mns1" and "mns2' are not declared. 2. using cc with DU 4.OD gives a core dump. The prgram works with gcc. Thank You for helping us, regards, B. Roessli