I couldn't figure out why I was not able to upgrade some characters abilities... there was no level restriction message (i.e. Character Level Required: ##) but the button to upgrade was grayed out. Turns out there is another row of materials needed and I was short on them.
I don't know how many sundays I missed extra events and challenges not realizing if you scrolled right there was all five available on Sundays...
Dev's did a bad job making it clear when there is more info to see in the UI and this is persistent throughout the UI.
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