The radar hotspots on the map are not all active at one time.  As you move from one to another, you will notice that some are active and not others.  If you click on one or two of the active ones, some of those which were inactive previously are now active and some which were active, now are not.  It seems that there might be a limit on the number of active hotspots.

Try the link below to see what I mean.

http://72.249.12.87/vt/d_brynildsen/canterbury_pl/3611_CanterburyFla.html#

Hi, Alan!

Disjo is right. The issue with the radar or hotspot is like with layers. If you have one under the other and there radar efect is to close it will cover the function of the one that is "under it". I solved it, changing the shape or design (Scanning Area) of the radar effect. Under "Sync Settings" of the radar "Properties" you can do it. It is a way of get around the problem.

Good luck, Martin