Consistent CTD (70%+ of the time) if you are in the builld/train screens and select more than one item when army moves are pending.

1.  Have armies moving on long paths that take more than one turn

2.  UI stops the move because a city is Zzzz

3.  Go to the Zzzz city and select multiple builds in quick succession

4.  CTD 70% plus of the time

It appears that the AI releases army movement again after you click the first build or train, and then the second selection causes the CTD.

Vox