My finder keeps appearing in front every minute, since this morning. While working in a program, suddenly the Finder appeared and I had to select the program again I was working in. Very annoying! After inspecting the crashlog, it seems to repeat every 90 seconds.
The only change on my system was the automatic update of Quicktime last night. While searching the forums on the internet, is seems that the latest version of Quicktime does not feel happy with Stuffit AVR.
The solution is to stop the Stuffit deamon. Go to your preferences pane, at the bottom, click the Stuffit AVR icon. Select stop. That solved my problem!