Application stack icons

Does anyone happen to know offhand how the icons that make up the Application stack get rebuilt? I've noticed that when I install new applications or update old ones, I get the following sort of "not found" icon. They generally go away quickly, other times they hang around for days. So I'm assuming there's an automated process that generates them... I'd like to kick it off manually if possible:

 

I used the remove/re-add the stack trick... works, but annoying, since I need to change the sort order and display again.

I'll give the finder restart a try next time. Thanks for the suggestions!