Great but with Glitches

I love it. Ive bought the 400 Easy Tactics add-in and when done with that plan to buy the Intermediate add-ins. Just a couple of things: Any puzzle involving pawn promotion freezes the game in my iPod 5 (I have up to date iOS) and Im forced to go to the next puzzle having (in the test Progress puzzles) been penalized points. The second thing: in Progress puzzles I can never isolate just one pack, I always get all the packs including the dreaded Hard puzzles even if it is unchecked.

gonzogulp about Chess Tactics Pro (Puzzles), v1.04