open the CB in any editor, find line 199, replace Navigator.PathPrecision with a numeric value (5 is usually enough, but could be more).
see if it helps
You could even go further and modify the CB to have this attribute passed from xml as an arg, just look up in any CB how to declare it (GetAttributeAsInteger is what you need)
what does it do? its a distance at which the CB considers next hotspot as reached, and if it's the last one- then behavior done.