HERE is another test for the UI problem. It removes building images that are not compressed when they should be and vise-versa, as well as lower the number of building images overall lessen ram usage as well if it is the infamous UI glitch after all). Extract to desktop and copy/paste and run the UI Fix Cleaner from inside the data folder, then paste the 'ui' folder into your data folder. These are the folders that should be backed up if you plan to undo it;
data\ui\eastern_european\buildings
data\ui\gondor\buildings
data\ui\greek\buildings
data\ui\middle_eastern\buildings
data\ui\northern_european\buildings
data\ui\southern_european\buildings
You can also just rename those buildings folders or send them to the recycle bin to un-delete later if you wish.
Also, someone can try renaming the shared.sd and strategy.sd files in the ui folder so the game regens new ones and see if that helps (don't use the File Swappers to launch after doing this).
When I get a chance I will regen the UI files in Bare Geomod, hopefully it is just the game being silly with regen the files and that will fix it.