Update: the latest update has fixed this issue. Please update to the latest version from Optilink Online site.
The issue: After click Trace button an error message shows "Please check if Tracer server is running. " When checking the console will show "Failed to load resource: " and "Access to XMLHttpRequest at ... has ben blocked by CORS policy."
The solution:
1. Go to site settings and add 127.0.0.1:22144 and set insecure content to Allow.
2. Restart Chrome.
chrome://settings/content/siteDetails?site=http%3A%2F%2F127.0.0.1%3A22144