Game Center + libGDX: Black Leaderboard

Hello,

I’m about to integrate game center into libGDX. The leader board is loading, but appears to be black. Does anyone know how to fix that issue?

Dear Marius,

is this a separate issue from https://discuss.multi-os-engine.org/t/gamecenter-libgdx-classcastexception/?

The issue is not related, and there is even no error log