Google in their infinite wisdom has decided that starting in kitkat (android 4.4), apps cannot write to removable SD cards except in extremely limited ways. This means users will not be able to use CC to put their library on SD cards. There is nothing we can do about this.
For the moment a user can get around the restriction by rooting the device and changing a system file. This is not something that we can recommend.
EDIT: for the latest information, see
this thread starting at post 42 and our FAQ answer
How do I use an SD card with Android 4.4 (Kitkat).