I've followed the Apple instructions
.....at http://support.apple.com/kb/HT4919?viewlocale=en_US&locale=en_US , entitle "iTunes Store: Hiding and unhiding purchases"
.......regarding "hiding" apps on the iTunes online store but this only hides them at the iTunes store but they still appear on my iTunes.
And yes I have restarted both itunes and my mac.
MacBook
Pro, OS X Mountain Lion (10.8.2), hot corners not working