New bug: u can close the game in the deck build menu. If u remove all cards from deck, and F4, then reopen the game u will have 0 cards.

Thanks for bug reporting, but I can't locate this bug on my own computer. 

So I decided to banned the auto save in deck editor, now the deck will only be saved when you quit this page through  close button.

And other card saving should be worked in the newest 1.02version now