I’m having the exact same issue, says it’s on monophonic mode but resets everytime you reload the project. Super jarring when you load up your project, press play and hear all those 808’s trampling all over each other - hope you have a limiter or some speaker protection on the master out!
I’ve also noticed that you can’t view or edit the sample by double clicking on the region with the sample track midi data, you have to havethe sample track selected in the project window, or else it says ‘no sample loaded’ - I’m sure it didn’t do this in 9.5.