Some time ago, decompiled the Windows client and presented my findings here: https://hackernoon.com/poking-the-bear-is-tunnelbears-client...
If you're using IPSec then there's a client built into the OS.
From the known issues page:
"If you are running on OS X 10.6.8 or higher and using OpenVPN 2.3.4 or higher and using a TUN device, the default Tunnelblick setting to "Load Tun Automatically" (on the "Advanced" settings window) will avoid this problem by not loading the tun kext — OS X's built-in "utun" device will be used instead of a "tun" device."
There your done...
The link is a test tool.