iPad: editing kit problems


I’m having some problems while editing percussion kits on the iPad. I cannot add existing instruments. That button does nothing. Also, if I add an instrument to a kit, I cannot “cancel” (There’s no button for it) and if I add an instrument, I’m “expelled” to the Setup window. It looks the way Dorico on iPad handles dialogs makes these weird things to happen. This also happens if I delete an instrument from the kit.
Besides, sometimes, after adding an instrument and being sent to the Setup screen, trying to add another instrument just locks the UI and Dorico eventually crashes. Some other times, after adding a second instrument, I cannot edit the kit further, nor doing anything whatsoever (not even closing the project). The UI is not unresponsive, but it does nothing.