Slow, inaccurate progress record, settings disappear

Slows down and crashes all the time.
Doesnt capture the progress correctly - loses data on completed exercises.
Doesnt save learning focus settings: i try to choose "Extended" but after next log on it goes back to "Standard"
When trying to use feedback function from iPad app, it gives "error" to enter valid email, although there is nowhere I can enter it. In website version my email is up to date.
Pretty bad for such an expensive app!

Mrsntsn about Rosetta Stone: Learn Languages, v3.6.0