iPhoto 9.4.3 always prints me "Sign in to Photo Stream using iCloud. In order to use Photo Stream, you have to be signed into your iCloud account in System Preferences." even If i have iCloud setted up correctly

same here.

PhotoStream FAQs are here - http://support.apple.com/kb/HT4486?viewlocale=en_US&locale=en_US

Try turning iCloud and PS off on all devices and then turning it on again on all devices - maybe that will kick start it

LN

I did all of that.

1. signed in out fmor icloud in preferences

2. rebooted mac every time

3. deleted mentioned files in the library directory ( + rebooted mac)

4. created another account with same credentials

nothing works.

finally I got it to work, but in aperture. iphoto still has some issues.

Exactly the same problem here,,, Photostream is apparently okay in aperture but instead of tghe test image i took with the new iPhone,,, I just get a grey cloud thumbnail and no image,,,, in iPhoto 9.4.3 though...No Chance!

Update your system to the latest Mt. Lion, 10.8.5 with this updater, OS X Mountain Lion Update v10.8.5 (Combo), and try signing into iCloud again in the System/iCloud preference pane. If you are already signed in sign out and then sign back in.

OT

I had some vary bad experiences with 10.8.5 forcing me to reinstall 10.8.4 and restore from a backup... ITerminal was hit with broken Sudo* / dyld messages when unsuccesfully trying to install some programs or run clean up routines... so "upgradint to 10.8.5" is the last thing I'll be doing-... maybe if there is a 10.8.6 and they fix these issues... but otherwise... not a hope in ****!

I have tried signing in and out several times... FINALLY managed to sign in to Messages with my iCloud Accound (I had pretty mucgh given up on ever being able to,,, simply signed out of both iCloud and Messages on my IPhone and then signed in Fresh... went back yo my MacPro and hey presto...
There are some seriously "iffy" issues with that side of Apple's operations... ICLoud and Mas... a Joke at the best of times...
However...I can live with Aperture... might just drop and forget about IPhoto altogether at this point... just leave it installed and switch Libraries in Aperture if I want ti access the IPhoto Library

*Sudo was virtually not there... had to go into some file and play with variables to try get it back... but there were still issues... and breakages preventing installation of some prgrams... Logitech Mouse drivers for one,,, but by no means the only one,,, so 10.8.5 - No Chance!

Sorry but do you have a question about iPhoto for the Mac thatbthebvolenteer users here can assist with? If you do please post a concise question with no editorial comments so it is possible to figure out what you want. Long rambling RANTs simply do not work

LN