Major error encountered. Can't combine 4 yellow cards for an item. Game completely freezes. Nexus 5 latest version of android. When I force close, card trade-in reset but no item. Potion trade-in and Gear trade-in work fine.
Also came across potion error where potion won't go away... meaning you can spam it infinitely. It was fun to test out different towers with 0 sec cooldown. I stopped spamming randomly and was at 14k% speed increase. Impossible to keep impatience before bonus round with most towers. I can't replicate the error but I wasn't really paying attention when it happened the first time.
Thanks for the report.
Actually, I thought I already fixed this for this release, but it wasn't the case.
I already have created a potential fix for it, but want to do some more tests before shipping another hotfix.