I created a new performance last night using 3 slots in the performance. I saved several times to the Kemper, but when I accessed it today, the third slot is blank - and slots 1 and 2 don't have a lot of the changes I made to them prior to the save.
Also - there seems to be a bug around enabling a performance slot. When you click an empty slot, you cannot click the icon to enable it. You have to navigate to another performance and then back before it can be enabled.
The same thing happens with re-naming as well - you seem to have to navigate and load another performance and then come back before you can re-name it.