Did anybody else's Battle Coliseum stop working? :( The battle items don't work... :(

hey! can you be more specific about what isn't working? this guide may be able to help fix your issue!

it also doesnt mention these 3 things, just bc you brought up items specifically in your post:

1. if your pet is frozen in a battle you wont be able to click on anything until the next turn
2. you have to manually select items if preselection is off
3. you can't use items that are above the tier of the pet you're using