Below is the answer from our tech department, pls kindly check, tks 1. The problem that all sources are changed to the same one is caused by modifying the source list.. When creating the first Activity, the source list for the projector needs to be fully populated with SAT, Game and Blu-ray sources to avoid changing the list every time you add activity Select SAT for the first Activity The second Activity selects Game For the third Acitivity select Blu-ray 2. Solution : If you have already changed the source list, you need to correct the source positions of the other associated Activities, Edit ----Startup settings, find the source item, change it to the correct source location and save it.