Can't open apps
I have problem to opening applications on Mountain Lion but the problem I had also on Lion. Applications that not belong to Apple ( except safari, quicktime, itunes...) can not be started as soon as I restart the computer but I have to wait at least half an hour. I went to genius bar several times but they never saw a problem like this and they upgraded my os to mountain lion but after a couple of weeks the problem started again. This happened after they changed my motherboard because of the problem of black screen circa one year ago but I don't know if it's related to this problem or not. Is there someone that had this problem before?
MacBook Pro, OS X Mountain Lion (10.8.1)