After updating to OS X 10.10.3 (with the combo update) all Dock icons from Apple applications are only simple white icons with an "A" in them. This applies i. e. to Safari, Mail, Message, Systems Preferences, and others. See also attached screen shot. On top of that Mail seems to start (I can switch to it and it shows its menu bar) but does not show any window. Restart does not help. Repairing permissions (which I also did before updating) does not help. Does anybody else experiences the same? Any ideas what to do (except for going back to OS X 10.10.2)?