Dock icon always showing

Since the latest update Skitch did always appear on the dock. I had to edit the plist file as described here:

http://getsatisfaction.com/rescuetime...

This made the dock icon disappear, but there is another annoying issue. I am always asked whether I *really* want to open that program on launch, as it was downloaded from the internet. That message should only show once, not always.
 
happy I’m happy, because the RescueTime trick worked
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