Hi Mark,
Unfortunately there seems to be a problem where Windows Defender or Bitdefender blocks LINKPlanner from running the embedded Internet Explorer view.
Syadnom has a solution - Link Planner google maps crash, resolution?.
Windows defender and bitdefender both block MSHTML activex execution. I would imagine this is a common block. Excluding just Linkplanner.exe doesn’t do it, have to exclude the entire linkplanner folder and then it loads.
Try that and see if it works for you.
Thanks,
Andy