@@AirMAX
I had the same problem as Shadowgar. In the prebattle screen the card atk values are correct, but at the start of battle after the link advantages are applied, the damage drops down to zero making the battle unwinnable.
I noticed that in the team list the individual cards' and the team total atk is no longer consistent after completing missions, unlike your previous update where the total atk was stable. Now the total atk swings from 2 billion to 300 million after checking after missions. I even saw a negative integer at one point. I'm just guessing, but at some high atk, with the combination of links in battle that increase atk up to 70% it may reach some sort of threshold causing the atk modifier to roll over to zero. Perhaps lowering the atk modifier to tens of millions instead of hundreds of millions may help.
I deleted the plist and reinstalled the hack and haven't seen the 0 atk since, but there's no guarantee it won't happen again. I hope you get a chance to look at it. In any case, thanks for the hack!
Update: It may be random, but it's happened to me 3x in the past 10 missions. Deleting the plist and reinstalling did not make a difference.