White circle crossed on certain apps in apps folder

I downloaded VLC and handbrake. After installing them, I find them in my applications stacks all whited out with a circle crossed out. What does this mean? How can I fix this? I clicked on the applications that have this and they seem to open just fine (that I know of) Am I doing something wrong?

Thanks in advance for anyone's help, it will be greatly appreciated.

BTW, Day 3 using OSX. I love it!

I think this is more likely related to your install of OSX (I'm assuming you installed this recently, "day 3" and all). If you were running something earlier than this, it is likely that there are some applications that will not run under the OSX environment. However, if you are still able to open them and have them work, I don't know what is going on. When you actually visit the Finder locations of your stacks, does this occur (i.e. your Applications, Documents, or Downloads folders)? If not, then try dragging your stacks off the dock and re-adding them by dragging the original folder back onto the dock.

-Nik

If you log out and back in they will be fine.
That or restart the computer, maybe even relaunch Finder (not sure if that one works)