Since about a week I have some icons in the Dock and in the Launchpad (e.g.: AppStore, Mission Control) with low-res icons.
However if I start the app (in this case App Store), the correct (high-res) icon is displayed:
After quitting the application, the low-res icon will be displayed again.
I have the same symptoms for a handful of apps (mainly Apple applications).
What's the cause of this, and how can this be fixed to ensure high-res icons are shown?