I agree that we need some feedback from Steinberg else the reputation of this product is going to head south pretty rapidly.
However, I also think that some of the recent problems might partly be due to IOS 7, as many other apps have become more buggy (including Apple apps). For this reason, probably going back to 1.6 might not help (is it even compatible with IOS 7 ?)
I am eagerly looking forward to IOS 7.1 and Cubasis 1.8