Im a long time Trainz user just returning to the sim after a few years off. my last version was TANE. I recently bought TRS22 platinum. I play on a MacBook and it runs surprisingly well. I have an external SSD that I have a copy of the current program that works perfectly for running all the routes, etc. the problem is saving anything. I get a message that says it couldn't save and I need to check my storage space. The SSD has more than 1.5Tb available space. any help is greatly appreciated.