Probably a glitch on the server side. Impulse might have downloaded new xml data for the ObjectDock update and this has now been pulled out from the public server for some reason.
IIRC Impulse will first load the local XML data and then proceed to get the latest version from the servers, but if the local version is newer it doesn't overwrite it and so you see that phantom update each time it starts.
Try reseting data again, hopefully it should clear that problem.
