For some posters it helped to
- log into a new user account and to sign into iCloud from this account
- and to enable Photo Stream in Aperture from this account. Import some images, then sign out of Photo stream again and log off.
- Log into your regular account, and try if you now can enable Photo Stream in Aperture.
Added: Just in case the above does not help: Your Photo Stream is stored in your User Library:
Check, if the permissions for your user Library need repairing, and set them to give you Read+Write access, if necessary.
If all fails, copy any images you find in this folder to a backup folder to save the image files and delete the folder.
Thanks for the suggestion, but it makes no difference - I set up iCloud on the secondary user account but there is still no way on my main user account to check either the My photo stream of the Shared photo stream with out the sign in message appearing, which prevents the check mark from being retained...
Interesting thing though is the images I'd chosen to share do appear in the Library folder, but aren't visible as shared in Aperture or my iCloud web page.
So - totally useless then.....
Then remove your user preferences, as described here:
and also check: iCloud: Photo Stream troubleshooting
Just to be sure;
I have photo stream and sharing set up on iCloud
You have enabled iCloud in the "System Preferences" and clicked the "Options" button beside "Photo Strea" to enable "My Photo Stream"and also "Shared Photo Stream", right?
Tried removing and putting back the perferences ...
The second link given is no help as YOU CANNOT tick the iCloud preference boxes in Aperture for the reason mentioned.
"You have enabled iCloud in the "System Preferences"" - check - although this is actually installed on installing in setting up Mountain Lion after installing...
and clicked the "Options" button beside "Photo Stream" to enable "My Photo Stream"and also "Shared Photo Stream", right?
Yes, and tried all combinations of both trying to get somethign to happen.
iCloud - what a dead loss....