I work on a MBA mid 2012 - 1.8GHz i5 4GB - running 10.10.4 yet after a couple of dodgy restarts. Certain apps now won't open, they just bounce in the dock then close. Some of the apps are day to day apps like chrome. I have looked into verifying the disk permissions as well as repairing them. That didn't seem to do the trick neither did deleting the library files. Any ideas? I don't fancy rebuilding it, but ill have to if it continues.