can't make a move

For whatever reason, my Merchants are no longer able to move and I cannot figure out why. Despite having available trade routes, I can send a Merchant to another city. I have tried the "Possible Trade Routes" pop up window as well as the lower-right manual move option. Additionally, it will...

:c5science: I get application crash when I'm about to discover the Civil Rights tech. Is it possible to fix this? Game save, crash dump and WER crash report are attached.