Thanks for the feedback and bug reports!

v1.12 changes

• Protecting trade routes now lasts for a year instead of a season. 
• Transparency on how many troops are currently assigned to protect trade routes (max 5).
• Hard Mode re-balancing (just got slightly harder):
  • Increased the potential cost and cap of hiring mercenaries
  • Scorched Earth: Computer opponents will now raze their buildings and partially destroy their trade and tech levels if conquered by you

Bug fixes:

• Fixed a bug where Demanding Tribute will cause the View command to break.
• Fixed a bug with Plague Doctors sometimes not working correctly for a few select countries.
• Fixed a bug where you could have negative troops after attempting to assign them to protect trade routes.