It's turn 68 and I'm playing as the Cravers. A few turns earlier I got the neverending "Turn Pending" bug with Hanna (AI) being "In Talks", but I loaded a save from 1 turn earlier and the bug didn't appear again. However, this time after I press "End Turn" all buttons stopped working.

AutoSave 5719.sav

I thought it might be because of my trade route got blockaded, so I stopped my trade subsidiary from being built and I deleted my trade company. This allowed me to continue my invasion but then all buttons stopped working again.

This is the save before this bug happens: Craver 9.sav