[DCP-o-matic] DOM 2.11.77 install problems on Mac OS

Have just installed 2.11.77 on Mac OS. It did install in the end but Gatekeeper took ages (far longer than most apps) to run. Steps to reproduce: 1. Copy DOM (main app) to Applications folder 2. Open DOM 3. Gatekeeper says "Verifying DCP-o-matic 2" 4. Progress bar stalls about halfway through for around 5 mins (see attached image) 5. Finally completes Same thing with DOM Player. This length of time is unusual for installing apps, so I imagine many users would think that it's crashed. This is on Mac OS Sierra 10.12.6. Jim