I performed an app store update to Yosemite from Mavericks on my i7 mac (late 2012). 16gb ram.
Model Name: iMac
Model Identifier: iMac13,2
Processor Name: Intel Core i7
Processor Speed: 3.4 GHz
Number of Processors: 1
Total Number of Cores: 4
L2 Cache (per Core): 256 KB
L3 Cache: 8 MB
Memory: 16 GB
Boot ROM Version: IM131.010A.B05
SMC Version (system): 2.11f16
Serial Number (system): C02KT0KCDNMP
Hardware UUID: 9BBC7CFB-8A1C-5389-A03C-2E17F76DD6B6
I updated monkey but it sits in the dock doing the bouncy thing. I downloaded and installed the updated drivers manually.
UX8 works fine with Logic x pro until I shut down the mac or the UX8 then I get a crash from a kernel error.
At lease I can function until I shut down.