Data transferred but not displayed in dashboard?

I installed Rescue Time and the tray icon shows logging is enabled. However, when going to the dashboard there is no data, although the site shows "last update from your compuer received xx minutes ago" (typically less than 30 minutes).
Using the Verify button in the data collector's settings screen either results in a timeout or - after hanging for 30 seconds to a minute - a "success".

does RescueTime use any non-standard ports? I'm behind a firewall but not behind a proxy.
 
sad I’m frustrated
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