Greetings! Seems like I have to press the "COMMAND+R" combo, everytime I go to the Updates section of the Mac App Store, for available updates to checked properly. Third-party updates do seem to show up automatically, but not Apple-branded system/software updates tho (might be coincidental). I never know when an update is released unless I follow the Mac news (such as a new version of iTunes) and then go to the App Store Updates section and press COMMAND+R. I mainly use a regular user account, but have an Admin account to authenticate with whenever major changes/installs happen on my OS-X 10.8 based 2011 MBPro. I have upgraded the hard drive earlier this year, which was about the time this issue began happening. I did a partial Time Machine restore (only my regular user account & data, if I correctly recall) onto the new hard drive & install of OS-X 10.8. Any advice how to get Mac App Store Updates to be automatically checked for as their suppose to be? Thanks, in advance!