Sometime a reboot or icon rebuild will fix the problem.
Well, here is how o solve the problem: For somehow, after applying 10A421a build, my quicktime icon has not changed (upgraded) in Dock. Looking in Application folder, i have noticed that the icon inside is in fact, the new one. So, i just remove the old icon in Dock and replaced for the new one from Application folder.
I just dont know why the icon is not upgraded after reboot and how the link for the app was working with older icon.
So case closed!