Hi all, i have a strange issue with my MacBook Pro 13. It started when some of the application didn't work. For example, i use MplayerX to view video files. Everything was ok, but now if i double click a video file, the MplayerX icon jumps on the dock, and thats it, and it won't play. Another weird thing - i can't edit or create playlists in iTunes. Started on the same time. Now, when i try to install apps not from Appstore, i get the app_name.pkg can’t be opened because it was not downloaded from the Mac App Store. I am trying to allow installation of outside apps, on System Preferences -> Security & Privacy. When im trying to open the make changes lock - i'm being promot to enter admin name & pass. Usually the Name field is already with the name, but now it's empty. I don't know my admin name, and i tried my regular name and pass, those taht i use to login to mac - didn't help. Note - under User & Groups, i see my regular user, the current on, with the full name. I tried to enter this name in the admin name field, and also the name of my user as it appears on /Users/user_mac folder - no luck. What are my admin credentials, or how to fix this issue? Please advise, thanks.