I couldn't give you the reason why this works, but you need to add -webkit-backface-visibility: hidden
to the element that is undertaking the CSS3 transitions
(kudos go to @JugularKill for his answer found here)
The reason this is particularly funny (to me at least) is that backface-visibility
in Chrome is considered broken/buggy!
So the solution, in your particular case, would be:
.videogallery .navCon .navigationThumb {
....
-webkit-backface-visibility:hidden;
....
}