I also have this problem, it's because of the smoke or fire. When I have a fire lit the icons turn into squares.
A thread about this on the old forums
http://forum.paradoxplaza.com/forum/sho ... 23631878a1And the bug is linked here
http://www.seatribe.se/bt/show_bug.cgi?id=3not sure if it's related to the OpenGL version in the gfx driver as the thread suggests, my OpenGL Version is 6.14.10.10600
I tried upgrading graphics drivers but there is only 2 drivers that are supported by my laptop manufacturer, the newer one crashes display driver all the time (on all applications) so I'm kind of stuck with the previous driver.
what's interesting is the interface bug doesn't happen if shadows are off, but if i leave shadows off the textures on the trees and my character don't load, so I kind of need shadows on.
possible fix would be to create a command or config file or interface setting to turn off smoke (or fire, whatever is causing this)