Iphoto is not opening library on launch

Question

When I launch iphoto 9.4.2 in OS 10.7.5 The font and color windows come up and all the menus, BUT the actual iPhoto browser window does not come up. I have tried reinstalling all the way back to 9.1 from my iLife 11 disc all the way up to this 9.4.2. no change
I have tried switching libraries and making New libraries, but each time i restart the program it either forgets where that library is or just Doesn't launch with it. If I Directly open the library by dbl clicking it, I can open it, and if i change any albums it seems to remember my changes--But iPhoto will not launch that default library or any other library when i just launch the program from the app.
This is a new issue. It has worked just fine within the last few weeks (not used every day, so not sure when it happened). I did recently load the iBook software which is working, but really haven't added any other new software recently. I tested all my other iWeb, iMovie, garage band are all working just fine.
I also tried repairing permissions in DiskUtility, as that used to fix problems a lot. no help.
Thanks for any direction anyone can lend.
Jeff

Answer 1

In case this happens to anyone else I had a discussion with Apple today and we figured out what to do. The order of most of this matters, so i'm trying to remember exactly as we did it. If for some reason it doesn't work for you perhaps i did the order a little wrong so test that. The keys to making it work were the quitting of iphoto before trashing the preference file and the Logging in and Out of whole computer before Re-Launching iPhoto again. I had trashed that Preference file Numerous times and can't be sure whether I had always quit iPhoto first (which i think i had), BUT I Know I did Not ever Log Out before when troubleshooting, so that may be the main key fix part??
1.     Quit iPhoto
2.     Trash the com.apple.iPhoto.plist file from the HD/Users/ Your Name / library / preferences folder.
(On 10.7: Hold the option (or alt) key while clicking on the Go menu in Finder to access the User Library)
(Remember you'll need to reset your User options afterwards. These include minor settings like the window colour and so on. Note: If you've moved your library you'll need to point iPhoto at it again.)
3.     Log Out of your computer.
4.     Log In
5.     Hold option key while launching iPhoto.
6.     Select the proper iPhoto Library you are wanting to use as your default library.
7.     When that library launches you should be good to go.
To check, go ahead and Quit iPhoto and relaunch as normal, and it should launch with the library you have selected.
*We also trashed All iPhoto preferences that were listed in the preferences folder, including the Lock files AND the iPhoto cache file from the HD/Users/ Your Name / library / cache folder. The Apple Tech support thought that the fix was probably from the making sure I had Quit iPhoto Before Trashing the com.apple.iPhoto.plist file AND the making sure I Logged Out and Back In After that Trashing and Before ReLaunching iPhoto. The Extra thrown away files was a precaution since we had already been through 1 tech support person with no results and the supervisor wanted to just have a Completely clean slate.
So hopefully that helps someone else in the future.
I know it made me Happy!