Using Version 1.2.0-rc6 on windows, but I've had this happen in 1.3 also.
Sometimes I'll make a pattern in the piano roll for an instrument, save my file, and then exit out. Upon reentry, I'll see that perhaps the pattern I've recently written hasn't dissappeared but a pattern has dissappeared from the song editor leaving a blank spot.
Many times I'll get lucky and it'll be a pattern that I've copied and pasted multiple times in my song and all I have to do is copy/paste the pattern into the blank space. Other times it's a pattern I've haven't used anywhere else and I have to just completely remake it or think of something else because I can't recall how I made the pattern in the first place.
Sometimes I'll make a pattern in the piano roll for an instrument, save my file, and then exit out. Upon reentry, I'll see that perhaps the pattern I've recently written hasn't dissappeared but a pattern has dissappeared from the song editor leaving a blank spot.
Many times I'll get lucky and it'll be a pattern that I've copied and pasted multiple times in my song and all I have to do is copy/paste the pattern into the blank space. Other times it's a pattern I've haven't used anywhere else and I have to just completely remake it or think of something else because I can't recall how I made the pattern in the first place.