Version 1.6 really helped the stability for me, but I still see a good number of bugs:
1. One of my cities shows the wrong name on the city HUD. It shows and enemy city's HUD popup.
2. I have at least two heroes that use the baby image as pictures.
3. I have a fire shard in my territory that can't be selected. I had a shrine on it that was wiped out by monsters, and ever since then, I can't select it.
4. When I click on a space in a city to build a building, and am zoomed a good way out, it often puts the building in an entirely different place.
5. Magic is broken. Spells that should do over 100 damage consistantly do less than 10. (I think this is a known problem.)
6. Occasionally (quite often, actually) the game freezes while it hits the hard drive, probably loading graphical resources. I have a killer rig that plays Crysis maxxed out, and large Civ IV maps without a hiccup, but this game freezes quite a bit. This isn't a framerate problem - it is a case where the game freezes for like 30 seconds while loading things from the hard drive, and it happens every few minutes.
7. When I save a game while viewing the cloth map, when I close the menu screen the game shows the normal map, but without any buildings or units. I have to zoom in and then back out to fix the problem.
8. I consistantly have quest locations the do nothing when I put a hero on them, even though the hero has no quests and I have the proper adventure level to access the quest building. (Not sure if this is a bug or if I am just missing something.)