iPhoto's PhotoStream doesn't work [uncheck itself]

Hey guys.

I am not sure why but I am unable to check "enable photo stream" in iPhoto 11. Every time when i check on "enable photo stream", it would uncheck itselfs immediately!

I spoke to an Apple Genius about it. While speaking to her on the phone, I found that the problem is actually unique to my photo Library! i.e. if i create a new photo library (alt+click iPhoto), photo stream will be working absolutely fine. However, I have got lots of faces, events, albums in my old library that I am very reluctant to give up. I am sure some would understand.

Does anyone know a solution to this? Or if you have any way that could hasten the progress of restoring my iPhoto albums lists, events and etc.

Thanks so much!

I found a solution to it actually. Not sure if anyone will need it, but for future references.

press and hold on Command + Option and click iPhoto. Check every box there is available to it. It will start rebuilding your entire library while maintaining your albums and library!