I upgraded to Yosemite (via the Mac App Store). Everything seemed fine during the installation but, when I sign in, I can't get my dock or my desktop background. I checked the System Preferences and everything seems fine. I've also re-started. Still nothing.
I also get this weird error I've never seen before. See this screenshot: imgur: the simple image sharer
Any ideas on how to fix this?
Running a Macbook Pro (early 2011)