It is also crashing when I save. I am using 4.1.8. Here is my Excel channel listing. I did put the big matrix last for start channels, I also have two matrices a smaller one 64 x 128 for my Tune to sign. I am using BeagleBone Black and Octoscroller with Falcon Player to drive each of the matrices. Each one can drive up to 64 16 x 32 panels in the matrix. I have the 54 x 128 working and I will have to get a video of it and show off. I hope the save issue is easy to fix, I did the channel setup with 251 universes, set the save folder, built the models, went to create new sequence, added text effect to smaller matrix and saved. It just sat there no saving but curser moves and you can select shutdown. You get a warning about losing unsaved data and that is it, you have to use Task manager to close it down.