My system: - MacBook Pro, mid-2009, 17" - Yosemite (10.10 (14A389)) and have Parallels 9 (Build 9.0.24251 (Revision 1052177; Thursday, August 28, 2014)) - Windows 7 virtual Issue: - After the upgrade I am finding momentary blackout flickers on the virtual while working in it - They come and go and are not consistent - I did not have 3D Acceleration enabled and have latest version of Parallels 9 from what I can see - This did not happen before upgrading to Yosemite I hope this is an issue that is going to be fixed asap.