Well, i understand that the problem can be masked using a "turn on" option key, the thing is that when i'm drawing in 2d and i must constantly input massive commands with measures using the Track option, it becomes extremely annoying having to activate the Tracker option several times a minute...
Concerning Dwight's reply, i've already tried the two available options and none seems to fix it. I think i the problem simply relies in some software bug...
Anyway, thank you both for the replies.