Intel HD 2500 Graphics and Yosemite

I recently installed Yosemite 10.10.2 as an update to my previous Mavericks based hackintosh. I now have graphics issues, specifically at the log on screen and in google chrome (but not safari). Portions of the screen are glitchy and flash what is being displayed on and off. Everything else works fine, no other program has this issue.

As I said, I previously had Mavericks installed and the graphics worked fine (with the exception of some lagging while using LaunchPad, this installation has the same issue).

Specs:

• Intel i5-3570 @ 3.9GHZ (Ivy Bridge)

• 8GB 1600Mhz DDR3 Ram

• Gigabyte GA-B75M-D3P Motherboard

I've tried these things so far:

• Changing BIOS video memory from 64M to 32M.

• Switching on GraphicsEnabler = Yes in multibeast.

• Changing system defition from Mac Pro to Mac Mini (neither worked).

• Enabling the Intel Graphics Patch for Mixed Configurations.