Hi Paul, Sarah, and Others,
I did some research, and there's an Apple Support document about "Hiding and
Unhiding Purchases":
http://support.apple.com/kb/HT4928
This is supposed to cover the case where you delete purchases and can't find
them again, but it doesn't quite sound like your problem. (Also, the document
is dated October 2011, so I don't know whether Mountain Lion changes things).
When I tried this on my system (still on Lion) there was, indeed, a "hide"
button in the App Store purchases list (column 4 of 5), and pressing it made
the item go away entirely (no dimmed button; it simply no longer showed up in
the list of purchased items). I was able to unhide items by following the
directions in the support document:
1. Open the Mac App Store.
2. Choose Store > Sign In, and enter your Apple ID and password.
3. Choose Store > View My Account.
4. Click on View Hidden Purchases from the Account Information page.
This was useful to know and it seems worth posting in case someone else hits
this issue, but doesn't seem to fix your problem.
My guess is that the preference files for the App Store somehow got corrupted
on your system. I'd try quitting all applications, then either deleting or
moving the two plist to your Desktop or other location, and rebooting. When
you open the App Store again it should recreate the entries with the correct
(updated) information. If not, you can always move the old plist files back to
their original location.
The relevant files are in your user account's Library preferences folder:
~/Library/Preferences/com.apple.storeagent.plist
~/Library/Preferences/com.apple.appstore.plist
You probably should quit all applications on your Mac (to include ones that
might have been purchased through the App Store), delete or move the two files
listed above (e.g., use the Command-Shift-G "Go to folder" shortcut in Finder
to go to your Library/Preferences folder). If you do this in one step remember
to type the leading tilde character that indicates your home directory,
followed by a slash, and then "Library", then slash, then "Preferences". If
you do this in two steps, use Command-Shift-H to go to your home directory,
then use Command-Shift-G and type "Library/Preferences" into the text field
with no slash at the beginning needed -- just the slash between "Library and
"Preferences". Once inthat folder find the two plist files to delete or move.
Then reboot your Mac and check that your "Purchases" and "Updates" now look
correct.
HTH. Cheers,
Esther
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