IPhoto (9.5.1) will not open in OSX Mavericks

Question

Grateful for some help. A few months back we had to take our Mac into Apple store because TimeMachine wasn't backing up. They ran loads of diagnostics and said problem was a corrupted OS. We backed up everything and they loaded OS X Mavericks on for us. They then re-loaded everything from our back-up. Everything seemed to work ok except Iphoto which would not open. We called the Apple Support people who talked us through some steps. They couldn't identify the problem but said they could solve it by creating a second iphoto library (2). They did this and whilst it opened ok all of our old folders had disappeared.
However now (few weeks later) iphoto will not open at all. I have tried to access it through the desktop, Applications, finder etc but no joy. I've read through various community conversations and see that there has been problems with OSX and iphoto. I've tried downloading Library Manager Upgrade 1.1. but when I try to run it says my version of iphoto doesn't need it.
Details:
iMac 27" Mid 2011, 2.7 GHz Intel Core i5, Memory 4GB 1333 MHz DDR3
OSX Mavericks 10.9.2 (13C64)
IPhoto V9.5.1
Any help please!

Answer 1

Try this:
From Finder, hold down the option key on your keyboard and click on the Go menu at the top of the screen
Select Library from the drop down menu
Then navigate to Application Support > iLifeAssetManagement > assets
Right click on the 'sub' folder and choose Compress
Drag the resulting zip file to your Desktop (as a backup)
Go to your System Preferences and choose iCloud
Turn OFF the iCloud Photos option
Go back to Library > Application Support and DELETE the iLifeAssetManagement folder
Now, in System Preferences, turn the iCloud Photos option ON
iPhoto should now be able to launch. Give it enough time to re-download your Photo Stream content. Unzip the sub folder on your desktop and drag that into iPhoto if you are missing any of your My Photo Stream photos (more than 30 days old).
Credit to user photosb189 for that.