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Yeah @tturner86 nailed it with regards to the breaks in th engine light. The arc is normal and depends on a couple factors, trajectory you are launching towards meaning are you going to an orbit that is near the equator or polar orbits or whichever. I'm guessing part of the reason that orbcomm sats were switched to this flight was because of trajectory. Orbcomm sats go into polar orbit which means they circle the earth vertically over the poles (sorta). Think GPS satellites and also spy satellites. As opposed to the SES sat that was supposed to go into a comm position which is normally geosynchronous. Think direct tv receiver. Those sats sit out at a spot that allows them to rotate at the same angle as the earth. So once you position it then it covers the same part of the earth all the time. In contrast a full orbit for a polar orbit sat is something on the order of 90 minutes.
So the reason for switching those missions is GEO orbits require a lot more speed so the arc change from launch site is large. What that means is your down range velocity is higher, and if you want to hit the launch pad with the 1st stage whatever speed your going down range with you have to stop and have some speed the opposite way. Polar orbits the 1st stage can keep a relatively straight up trajectory and then let the 2nd stage do a lot of the horizontal speed work.
But the problem is you can't go straight up because if something were to blow up 10 miles up and the vehicle was straight over the launch pad the debris field would be huge and casualties could almost be guaranteed to a small extent. If you want to watch something scary YouTube search delta 2 explosion. Happened in the 90s and the barrage of molten metal that rained down on everything was amazing. So to cap this off the vehicle will arc over the ocean to minimize the debris field. If you were launching like sea launch from the middle of the ocean off a platform then going straight up wouldn't be an issue.
All this comes back to stocks though ... And the unfortunate detail that I doubt space x will go public any time soon. 5 years minimum would be my best guess. Problem is it's not in elons best interest to go public.
