After over a month of flawless use it stopped working. I was mid-flight when Charts (on iOS) stopped showing my position. After investigating I found that Simlink on my iMac was at 100% CPU usage and shown as “not responding”. I tried killing and restarting it. I tried rebooting. Nothing helped. So I deleted the Charts and Simlink apps as well as the file in X-Plane plugins. I then re-installed Charts and Simlink and went through all the setup steps. I refused the suggested Simlink update. After doing this Simlink was working again.
So at the moment it is functional but I thought it worth reporting.