Editor will not launch anymore

Development Platform & Builds
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Please Help.
The engine Editor has gone from bad to worse and now won’t launch at all.
MacBook Pro Yosemite 10.10
i7 2.8GHz
16GB
1TB SSD
GT 750M
UE4 Binary 4.5.1
link text

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Duplicate post of OSX - Anyone know how I can get the engine running again? - Programming & Scripting - Epic Developer Community Forums