Does anyone else have this annoying pop-up come every so often? I noticed it mostly occurring especially after quitting Safari, so it may be somehow related to Safari. It's annoying because when clicking iCloud Preferences..., the pane looks perfectly normal (as in, nothing needs to be fixed or my password re-typed). It's been a bug with Yosemite since 10.10.0 (am on 10.10.1). I wasn't sure if I was the only one. I've spoken with Apple Support about it, but they didn't really know anything. I also filed a bug report at bugreport.apple.com, but was wondering if any of you had experienced the same occasional pop-up, at random? And, yes, I did a clean install of Yosemite initially (old PC habit), then an in-place install to try and resolve this (and a few other) issues, with no luck for this specific issue.