Weird one today, and I’ve owned and used DT for 6 years. There was a productive day of working prepping a live set, updating older patterns, and saving the project regularly along the way. After a power cycle, seems nothing that I have changed or added was saved. In particular, at first glance what I am seeing is Midi track channel assignments nor program changes have been saving.
I don’t understand!!! Running 1.50.
Not sure this ever got solved and it got reported by a few people.
It only happened to me when I accidentally created 2 samples with the same name and loaded them into a project but I suspect this was a coincidence.
Never had an issue with 1.52
1.52 has the updates which allows you to turn off the backlights which for me was a game changer. Perhaps you got blinded by the 1.50 light show and forgot to save 
sorry. Joking.
I have no idea what might have happened. I am now trying the work around of saving into a fresh new project.