Can't save dashboard

Using Docker 1809 on Windows 2019 I’m unable to save dashboards. I can create data sources and make graphs from them but when I click on the save icon and then “save” nothing happens.

I don’t see any error in the logs when i click save and nothing when looking at the developer tools console.

Uncommented parts of my custom.ini:

data = C:/grafana/mnt/
logs = C:/grafana/logs
plugins = C:/grafana/mnt/

log_queries =

level = debug