Another new game version was released today. I updated, which was easier this time because the APK link on their facebook page actually worked. Looks like they have fixed the issue with the mechanics of dealing damage in the arena. Had my first proper arena battle in a month, and it was nice.
They claim to have fixed the matching system in friend battles, but I was still unable to find a random match today. It might be too early after the update, with not enough people having installed it yet.
Not sure if they have fixed the mini medal rewards yet (where you need to get them in a certain order). I also haven't checked on things like whether they fixed Gem Slime's mini magic burst thing.
If anyone has any observations about the new version, please post them in here.
EDIT: Just found that they still haven't fixed the bugs with leader perks in quests. If you select a pal with incompatible leader perks, you could still get screwy stats. I am running Clown House bonkers with a team of max level guys who all have under 50 MP, which is about 1/5th of the usual amount. Great.