I'm having the same issue. It started for me just after I made a purchase. The game paused and now like you, when I try to open the app, it gets stuck at 37%. My payment went through. I hope that I got what I purchased.
I have had my app crash every time I try to play a season game,bonus game, and prime event game on my iPad. Works fine on my iPhone Contacted glu multiple times with no answer. You think they would ask for the iOS software # or something. It’s like they don’t care. I’ll never spend money on here if they can’t correct this issue.
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