I wonder what kind of pc you have TU...
I rendered the first frames in about 30 minutes, and later on that gradually became 50 minutes as the camera gets closer to the planet.
But without changing any setting I saved, installed the upgrade, loaded, entered new starting frame number and rendered again. Now all the frames take exactly an hour longer, so almost 2 hours. I re-rendered one of the 'faster' frames, frame 2174 (I upgraded at frame 2176), and it took as long as all the other frames I rendered with the gold version. So forget a frame issue, nothing changed there.
It's either a bug in the software (in the '+ Animation' version), or in my pc... the latter is also a good possibility of course
So if anyone can render frame 2174 (or a sequence from 2170 to 2180) with both the beta and the gold build and tell me the results, I'd be a step further in solving this.