I looks like this.
I did not install any mod. It seems like there are other players sharing the problem with me. -->[reports from a Chinese forum]
As far as I know the problem was not there until yesterday. There may be something wrong with the latest update.
Steps to Reproduce
Start the game, and click "Mods".
Start the game, and click "Mods".
A developer has marked this issue as fixed. This means that the issue has been addressed in the current development build and will likely be in the next update.