Canada here! I've been having issue with properly downloading software from the App Store since I started using Yosemite 10.10, items appear in the Software update list but won't download and up date. Apps appear in both the "Update List" and "Updated in the last 30 days list". Eric Root listed some instructions on a forum somewhere here on how to reset the App Store Application by going to the Terminal Utility and it appeared to work once but the same issue has continued to come back. I have included a screen shot of what that looked like.
I've tried to do that again with no success now my App Store Updates Screen looks like this.
I saw the Apple Lisa demonstrated, I had an Apple 11e and an Apple Iic and several Macs since , plus I also have MacBookPro, iPod and iPhone and I am just about ready to dump my whole life long relationship with Apple over the terrible mistake I made of upgrading to the buggy Yosemite 10.10.