Why does Photo Stream keeps switching itself off?

Question

Hello
I use Photo Stream, but I sometimes wonder what the point is as I have found it to be extremely temperamental. Probably 90 per cent of the time I start up iPhoto, I find that Photo Stream has switched off on its own and of course I then have to spend a valuable minute or two switching it back on again. Sometimes new photos do not sync to Photo Stream as a result. This odd glitch has gotten increasingly irritating with time and I would love to fix it. Does anyone have any ideas? Thanks in anticipation!
PS - I am using the latest version of iPhoto

Answer 1

Do you have more than one library?  If you do each time you change libraries you will need to activate PhotoStream for that library as PhotoStream can only be activated on one library at a time.
If you only have one library try the following:  make a temporary, backup copy (if you don't already have a backup copy) of the library and try the following:
1 - delete the iPhoto preference file, com.apple.iPhoto.plist, that resides in your
     User/Home()/Library/ Preferences folder.
2 - delete iPhoto's cache file, Cache.db, that is located in your
     User/Home()/Library/Caches/com.apple.iPhoto folder. 
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3 - launch iPhoto and try again.
NOTE: If you're moved your library from its default location in your Home/Pictures folder you will have to point iPhoto to its new location when you next open iPhoto by holding down the Option key when launching iPhoto.  You'll also have to reset the iPhoto's various preferences.
OT