OS X 10.9.5 When did this happen? I haven't performed any system updates that could account for this suddenly being a thing. Did Apple sneak this on me/us*? It occurs whenever I open a newly-installed/downloaded app. It leads up to the Gatekeeper dialogue's appearance. *Perils of the internet: if I say, "me", I'm paranoid; if I say, "us", I'm scaremongering and/or exaggerating.