Check out this:
http://www.gottabemobile.com/2015/04...-from-ios-8-3/. Instructions for downgrading to 8.2; get in quick whilst the downgrade is still possible. I have not tried this, as I am still on 8.2, and won't upgrade now I have seen the problems you are having.
This looks like a problem with IOS 8.3. IOS 8.2 with the latest Calibre (2.24 Win 64 bit) and IOSRA (1.4.7.0.0) works OK.