Pycharm 3.4 (new installation) will not work on Yosemite with Apple JDK 1.6:
Crashed Thread: 32 Java: AWT-EventQueue-0 Dyld Error Message: Symbol not found: _CGContextSetAllowsAcceleration Referenced from: /Library/Java/JavaVirtualMachines/1.6.0_65-b14-462.jdk/Contents/Libraries/libawt.jnilib Expected in: /System/Library/Frameworks/ApplicationServices.framework/Versions/A/ApplicationServices
There are recommendations to switch to Oracle JDK 1.7, but since it is recommended to use the 1.6 kernel, I would prefer to stick with this version.
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