Same problem here…
After an indeterminate time, when I was using my mid-2012 Retina MacBook Pro running El Capitan connecting via OpenVPN 256bit, the fans started going crazy and the rear centre of the laptop got super hot very quickly. Happened daily, pretty much.
iStat widget showed GPU Diode temp getting to 92 degrees, and Activity Monitor showed vyprvpnservice as using over 100 and once, over 200%, of the CPU. Quitting vyprvpnservice caused the fans to go down and temperature back to the 40degree range.
Following info on gn148178’s post I uninstalled, downloaded and reinstalled v184.108.40.20645 No problems so far, and I assume all will be good… will post to the contrary if necessary.
As an aside, I was told that mid-2012 Retina macbook’s (and later) might have a problem with some aspect of their GPU, or some such, and there is a recall scheme in action for affected units.