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Please see Bug submitted to Apple. Apple advises this known bug and now being worked on. Quickly I hope, as I am having to use Media Pro for an image library at the moment. iPhoto no longer works for me, as I work 100% in TIFF files and cannot edit any files stored in iPhoto since iPhoto 11 update.

Summary:iPhoto 9.1.3 is exporting TIFF files to external editor e.g Photoshop but changing file tag to JPEG suffix

Steps to Reproduce:Set Photoshop CS5 as external editor. Select TIFF image stored in iPhoto event after iPhoto 11 upgrade and click on Edit button. Image will not open in Photoshop, as iPhoto has appended a JPEG file tag to TIFF file. This results in JPEG read error in Photoshop. Not surprising as it is a TIFF file not a JPEG one.

Expected Results: TIFF file should open in Photoshop CS5

Actual Results:JPEG read error - see screenshot attached

Regression:If you drill down to originals of image in iPhoto library the same image that will not open via iPhoto editor, can be opened from Finder.

Notes:This is consistent across both my 2009 2.53 GHz 13" MBP and my 2007 2.16GHz 20" iMac. Using Photoshop CS5, V 12.0.4, so not a configuration issue. It makes no difference if you use iPhoto as imported or referenced library.