The Intel video chips tend to use on-board memory, and if you use a i5 can run out of memory. The newest versions of the game have been creating a lesser memory footprint so it's possible it's working again.

I only have i7s to test with - I play the game mostly on a 2013 Air with an Intel 5000 Graphics and 1.7G i7. I don't get good graphics, but neither do I need to play on the crippled settings, either.