I've had problems with this in the past, and it's worked fine as well, but it's reared its ugly head again -- I'm not sure if it's an option I'm not choosing or what, but anyways...
While in game, the XVM minimap just displays the name of the tank where it was last located instead of just displaying the class icon. Also, I have chosen the option of displaying destroyed tanks on the minimap as well, but it doesn't display them. Any ideas?