With the track cursor, there will be a dot at the data point position. When you click on the dot, the browser will generate a mouse click event on the dot, but not on the hypertext link for the line under the dot. That's why the hot spot is not triggered.
I have attached the new cdjcv.js below. Please try it to see if this can solve the problem. (The browser has a tendency to use the cached version of cdjcv.js. You can need to enable the browser developer tools to monitor the network. This will force the browser to reload the cdjcv.js.)