There seems to be an issue with the MIDI Clock / tick messages being sent to other apps when you are using loop points (particularly noticeable if you set one bar looping).
Each time the the bar loops the receiving apps tempo will drift out slightly. This doesn't happen with those same apps if you don't use Loop Points and just let the song run, they will stay perfectly in sync, so it seems that the transport is definitely an issue at the Loop Points.
This doesn't happen with all apps, so I guess some apps (depending on how they implemented MIDI Clock Sync, Song Position, Continue etc.) handle this issue better than others, but it is definitely a Cubasis Loop Point issue as it doesn't happen when your not looping. You can actually hear it drifting with each pass of the Loop Point. The apps that I tested that struggle with keeping tempo when using Loop Points are DM1 and Electrify NXT.
I've tested this issue my iPad Mini Retina. I also tested it on my kids iPad 3 and iPad Mini (non-retina) all running the attest OS and version of Cubasis. All devices show the same behaviour.
I'm hoping you guys can fix this issue