iChess 4.0 BETA ready for testing!

iChess 4.0 BETA is ready for Testing!
Its a big release and some things may have been inadvertently broken on some devices. Please help me test the App and report bugs/crashes!

//How to Test:
1. Either join the
MyChessApps G+ community https://plus.google.com/communities/108010145398500180406
or
Google Group https://groups.google.com/forum/#!forum/my-chess-apps
2. Visit the below link depending on the Free or Pro version of the App you have
Free:-  https://play.google.com/apps/testing/com.pereira.ichess
Pro:-  https://play.google.com/apps/testing/com.pereira.ichess.paid
3. Click 'BECOME A TESTER'. It should say "You are now a tester"
4. Click 'Download iChess from the Play Store' at the bottom of the page.
5. Test and let me know if you see any bugs/problems!

//What's new
* New material design!
* Mark puzzle as Favorite
* Improved Random puzzle function
* Option to hide Hint button (to remove temptation!)
* Sort puzzle icons by Title or Last Opened
* Auto open last puzzle file
* and more...