HVA is just an alert type of "Dangerous Zone", which when enabled AND there are data in *.txt or *.spc will show and triggered that alert type.
But I find it odd that your proggy showed Speed Camera alerts but doesn't triggered it; so I look at source code and it would seem the triggering mechanism is "provided" differently for Speedcam vs HVA. Furthermore, the triggering is not coupled with the displaying of the alerts. This is why you get a "half-and-half" situation.
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