I was working on my Deck and this Castle bug broke all the blueprints(those blueprints can make useless any Deck if you took) and i can't Save! I think this happened the same to ratyu but on a different way, i can't believe what is wrong with Castle, pls never Save your deck when Castle crashes or all your work will be in vain!
It's a simple problem that can be easily solved. I've had that problem a lot and I learn different ways to fix that problem temporarily. When you try to leave, it says "discard the progress or save" press save, sometimes when I leave and come back. It saved it even though it looked broken. sometimes it takes some time for it to save, so be patient. Finally just use the backup.
Just click the arrow button and save and it worked so next time, you should save every 5 mins so it won't lose the progress you work so hard so it will still be there