Exactly the same here. Only in the capital.

I think it's after the capital hits level 3 that it begins to crash when trying to train units.

Same here:  I'm probably about 2 hours into the game, two cities built.  Keeps crashing when I try to access the build menu for my capital city.  I've tried the 'train' button after selecting the city and have also tried opening up the city description window (clicking on the round picture at the bottom center) and clicking the button there.  Both result in a crash.

Clicking 'train units' at my level 1 city still works fine.  It's my level 3 city that automatically crashes once I click 'train units'.

Debug.err here:

http://pastebin.ca/2009307

If I wait a few turns I find that I'm able to get some training done without a crash and was finally able to get some pioneers out to build new cities.

I'm seeing it too, but it only crashes if there is a unit in the queue when I click on it. Level of city has not mattered having gone from 1 to 3 with this issue. I have been able to train without crashing when the queue was empty. Debug file does not show anything when my last game crashed other then a ton of missing sov spear_idle and twohand_idea animation calls. Plus the name rulesets files still won't mod. Bummer