Xcode 5.1.1 crashes on 10.9.5 Mavericks when run in User Account but runs in Guest Account Model Name: iMac
  Model Identifier: iMac9,1
  Processor Name: Intel Core 2 Duo
  Processor Speed: 2.66 GHz
  Number of Processors: 1
  Total Number of Cores: 2
  L2 Cache: 6 MB
  Memory: 4 GB
  Bus Speed: 1.07 GHz
  Boot ROM Version: IM91.008D.B08
  SMC Version (system): 1.37f3

Xcode 5.1.1 does not load up on Mavericks 10.9.5 when logging in from my User Account. However it does run from my Guest Account. I have deleted Xcode preferences , reinstalled Xcode 5.1.1 from the App Store and still the same behaviour occurs. Have also tried if changing the security settings Mac App Store only, Mac App Store and Registered Developers and Anywhere ; regardless of the security setting chosen the Xcode application doesn't load. This is truly annoying and stymies my productivity. I am not currently registered on a Mac Developer program but am registered with an Apple ID and can log into the Developer centre.

I would really like to get this solved.
This would seem to be an answer, but as my situation was resolved when I updated to 10.10 I cannot test to prove it, but share just in case it proves to be useful

https://stackoverflow.com/questions/22480382/xcode-5-1-doesnt-load-on-os-x-10-9-2-and-10-9-3/26704775#26704775