button_ipnext.BIF and button_ipprev.BIF are the up and down scroll arrows for the review panel. They are already known to cause visual glitches. If you have an annoying flashing bit at the top of the screen directly above them then this is why. I had no idea they were actually causing the CTD though, so this is an important discovery.
In retrospect this can also explain the corrupted GA cup icon on the review panel and the crash I was having when clicking on constantinople after ending a turn. That was probably also caused by the review panel up/down scroll arrows appearing.
As to the in battle synchonisation issue, AFAIK this is an Nvidia video card driver related problem. I have not seen or heard of this occurring on ATI cards.
In basic terms the mouse clicks are not being translated correctly onto the 3D space. If you can downgrade to older drivers, that may solve it. In my case it did not but changing settings in the Nvidia control panel eliminated the problem entirely. You can try those settings yourself, they are in the CTDs thread in the apothecary.
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