hekhemut said:
I have Sapphire HD 7870 with AMD Catalyst version "14.9 win 8.1 x64". the only problem is the faction pop up messages and note pages for factions, regions and characters as you mentioned but it can be fixed just open the page again. I have this situation with Viking Conquest too so not came from 1257AD version 1.11, all I can say its not a game breaking buddy and battles and world map are completely fine.
I have trees missing in battles, and I noticed it happens to Native and all mods.
13.12 is the latest drivers that this doesn't occur. Sadly, due to other games, I need to run the latest drivers. But you're right, it's not game breaking, but annoying.