I had that problem on my 787 once, when I was running the 3. whatever
software...

Turning unit completely off and back on fixed the icon/trail problem.
but this is because on that software version, it did not automatically
save plot trails on shut down. Now with the 4. whatever, it saves them -

long story short, try clearing current trail when this happens and see if
it fixes it - it should. I believe your "full" of breadcrumbs and it looses it's
mind someway until you clear it out. I may make them a gift of my
1998 vintage globalnav 310 so they can reverse engineer it :rolleyes::D