Today I tested new Yosemite Public Beta 3 and UE 4.4.3.
Still got problems with animation.
I’m uncertain on how to check version of nvidia drivers but I tried this in a terminal app.
kextstat | grep NV
36 0 0xffffff7f82d2b000 0xb000 0xb000 com.apple.driver.AppleEFINVRAM (2.0) <33 7 6 5 4 3 1>
111 2 0xffffff7f811f4000 0x276000 0x276000 com.apple.nvidia.driver.NVDAResman (10.0.0) <90 82 79 12 5 4 3 1>
112 0 0xffffff7f81475000 0x1ae000 0x1ae000 com.apple.nvidia.driver.NVDAGK100Hal (10.0.0) <111 12 4 3>
I do not have opportunity to do same on Mac OS X 10.9 to do comparison.