Holy thread resurrection batman! 2017, I have just bought an HD500 and one patch saves fine, the second one is having this mixer level issue - even if I make other changes! I have the latest firmware - you would imagine they might have sorted this by now! :( . . . It only seems to do it with this one patch so far - I wonder if a specific program's data becomes 'corrupted' in some way or if it's to do with the slot I'm saving into?