4.5 EAP won't launch on Mac OS X 10.10

I have been unable to get PyCharm 4.5 to launch on a MacBook running OS X 10.10. PyCharm 4.0.6 and earlier work fine but, so far, three different 4.5 builds fail to launch.

Double click the icon and I see PyCharm menu appear for a split second in the menubar but then it goes away and never starts.

Has anyone else experienced this or have any suggestions for further troubleshooting?
I've created an issue here https://youtrack.jetbrains.com/issue/PY-15664 which contains the stack trace from trying to run on command-line.
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The issue was solved by deleting ~/Library/Java/Extensions.

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