Still having problems with locking up

I am still having problems with the devotional being slow to load each time I open it and locking up on the iPad 2. I tried to mark a reading as a favorite and it has locked up. Eventually after exiting out and coming back later I will be able to move around in it again. I have had it locked up when trying to view previous readings. Very frustrating but I really like the devotionals. I seem to have less problems with my iPhone but I prefer reading on my iPad. I would just read the book if it had the scriptures all printed out.

$#&*(@ about Jesus Calling Devotional, v2.1.1