Zoom problem. Pics automatically zoom in when double clicked. iPhoto 9.5.1

Question

When I double click and open a picture from the photos libraray, they open with a zoom in on only a portion of the picture. When I click/press on Zoom button it reverts picture to original full size image. But once I let go of button it zooms back into corner. Every single pic zooms into the same bottom left hand portion. A navigator box opens that allows me to teframe but once that is closed, it again zooms back into same section.

Answer 1

Try the following:
1 - delete the iPhoto preference file, com.apple.iPhoto.plist, that resides in your
     User/Home/Library/ Preferences folder.
2 - delete the contents the following folder:
User/Library/Containers/com.apple.iPhoto
3 - reboot, launch iPhoto and try again.
NOTE: For Mavericks, 10.9,  go to your Home folder and use the View ➙ Show View Options menu to bring the this window:
where you can check the Show Library Folder checkbox.
If that fails as a test launch iPhoto with the Option key held down and create a new, test library.  Import some photos and test to see if the same problem persists. Does it?
OT