iPhoto 11 (9.5.1) hangs

Since about a week ago, iPhoto 11 (version 9.5.1) hangs, with with rotating ball showing, shortly after launching. The activity viewer shows that there are usually about 31 threads, but that nothing much is actually happening. I have to do a force quit to close the application.

I have tried re-installing OS X, but that had no effect.

The closest I have come to a fix was by following the instructions given by MarcKirk in https://discussions.apple.com/thread/2637283?answerId=12714935022#12714935022 copied below:

I experiened the complete system freeze after about a minute's use. I went back to iPhoto '06. Just spent an hour on the phone with an Applecare person. His solution actually worked for me, although it's only been about 15 minutes. The key as suggested by Terence Devlin, is clearing the cache, but it must be done in a particular way. Here is what he had me do:

1) Remove any old iPhoto versions you have installed (delete iPhoto and iLifeMediaBrowser folders in HD/library/application support. Delete iPhoto app.) empty trash.

2) Reinstall iLife 11, reboot (not sure if reboot is necessary here)

3) Before opening anything, do software update (to 9.1), reboot

4) delete ~/library/cache (in your home directory, not HD)

5) reboot (important to do it here before emptying trash)

6) empty trash

7) open iPhoto holding down option & command. Pick options 1,2,5,6 and rebuild

If you didn't reinstall an older iPhoto version, you may be able to skip the iLife reinstall. Try it.

By doing this I am actually able to launch iPhoto succesfully and look at existing photos, but when I try to upload new photos from my camera the same problem occurs, and I am back to square one.

I have made a new library by holding down option when launching, but the same problem arises even with an empty library.

I would happily include here the crash log, but it is about 87 pages long (when copied and pasted into MSWord), so I will leave that for now. Is there any way I can send a text file containing the crash log to this forum? Alternatively are there any particular bits I should include here that might help?

Thanks for any suggestions.